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69-529: The Petaluma Gap affects wind patterns (and thus microclimates and air quality) in the San Francisco Bay Area . Fresh marine air generally blows eastward through the gap, branching into southward and northward streams which blow toward the Carquinez Strait and Santa Rosa respectively. The southward stream brings marine air overland into the central Bay Area from the northwest. Warm air rises from

138-455: A PUD provides flexibility to create convenient ways for residents to access commercial and other amenities. In the US, residents of a PUD have an ongoing role in management of the development through a homeowner's association . Pattern zoning is a zoning technique in which a municipality provides licensed, pre-approved building designs, typically with an expedited permitting process. Pattern zoning

207-516: A combination of private and public planning. Other critics of zoning argue that zoning laws are a disincentive to provide housing which results in an increase in housing costs and a decrease in productive economic output. For example, A 2017 study showed that if all states deregulated their zoning laws only halfway to the level of Texas, a state known for low zoning regulations, their GDP would increase by 12 percent due to more productive workers and opportunity. Furthermore, critics note that it impedes

276-586: A compact geographic area. The mixing of land uses is common throughout the world. Mixed-use zoning has particular relevance in the United States, where it is proposed as a remedy to the problems caused by widespread single-use zoning. Form-based or intensity zoning regulates not the type of land use, but the form that land use may take. For instance, form-based zoning in a dense area may insist on low setbacks, high density, and pedestrian accessibility. Form-based codes (FBCs) are designed to directly respond to

345-404: A compatible group of uses are allowed to co-exist - or a combination of both single and mixed-use zones in one system. The main approaches include use-based, form-based, performance and incentive zoning. There are also several additional zoning provisions used in combination with the main approaches. Use-based or functional zoning systems can comprise single-use zones, mixed-use zones—where

414-400: A compatible group of uses are allowed to co-exist —or a combination of both single- and mixed-use zones in one system. The primary purpose of single-use zoning is to geographically separate uses that are thought to be incompatible. In practice, zoning is also used to prevent new development from interfering with existing uses and/or to preserve the character of a community. Single-use zoning

483-460: A developed industrial park may vary greatly from a wooded park nearby, as natural flora in parks absorb light and heat in leaves that a building roof or parking lot just radiates back into the air. Advocates of solar energy argue that widespread use of solar collection can mitigate overheating of urban environments by absorbing sunlight and putting it to work instead of heating the foreign surface objects. A microclimate can offer an opportunity as

552-461: A distinctive character. Mornings in the region tend to be foggy, followed by sunny days and windy afternoons. The cool evening temperatures help to preserve the natural acidity of the grapes over an extended growing season. Although many varietals are grown, the Petaluma Gap is best known for its Pinot Noir, Chardonnay, and Syrah grapes. In 2006, twenty-four local organizations and individuals formed

621-452: A drop in temperature and/or humidity can be attributed to different sources or influences. Often a microclimate is shaped by a conglomerate of different influences and is a subject of microscale meteorology . Examples of the cold air pool (CAP) effect are Gstettneralm Sinkhole in Austria (lowest recorded temperature −53 °C (−63 °F)) and Peter Sinks in the US. The main criterion on

690-505: A free economy, as poor zoning restrictions hinder the more efficient usage of a given area. Even without zoning restrictions, a landfill, for example, would likely gravitate to cheaper land and not a residential area. Single-use zoning laws can get in the way of creative developments like mixed-use buildings and can even stop harmless activities like yard sales. The Houston example of non-zoning or private zoning with no restriction on particular land use but with other development code shows

759-584: A high degree of flexibility, but may be complex to administer. The more a proposed development takes advantage of incentive criteria, the more closely it has to be reviewed on a discretionary basis. The initial creation of the incentive structure in order to best serve planning priorities also may be challenging and often requires extensive ongoing revision to maintain balance between incentive magnitude and value given to developers. Incentive zoning may be most effective in communities with well-established standards and where demand for both land and for specific amenities

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828-424: A menu of compliance options where a property developer can earn points or credits for limiting environmental impacts, including affordable housing units, or providing public amenities. In addition to the menu and points system, there may be additional discretionary criteria included in the review process. Performance zoning may be applied only to a specific type of development, such as housing, and may be combined with

897-405: A microclimate study. Microclimates can also refer to purpose-made environments, such as those in a room or other enclosure. Microclimates are commonly created and carefully maintained in museum display and storage environments. This can be done using passive methods, such as silica gel , or with active microclimate control devices. Usually, if the inland areas have a humid continental climate ,

966-433: A negative effect on the microclimates as well as on the geological and archeological findings. Factors that play into the deterioration of these environments include nearby deforestation, agriculture operations, water exploitation, mining, and tourist operations. The speleogenetic effect of normal caves tends to show a slow circulation of air. In unique conditions where acids are present, the effects of erosion and changes to

1035-431: A number of sub-categories, for example, within the commercial category there may be separate districts for small retail, large retail, office use, lodging and others, while industrial may be subdivided into heavy manufacturing, light assembly and warehouse uses. Special districts may also be created for purposes like public facilities, recreational amenities, and green space. The application of single-use zoning has led to

1104-873: A promotional group called the Petaluma Gap Grape and Wine Alliance, now known as the Petaluma Gap Winegrowers Alliance. In February 2015, the PGWA submitted a petition to the Alcohol and Tobacco Tax and Trade Bureau (TTB) to establish the Petaluma Gap as a formally recognized American Viticultural Area (AVA). On December 7, 2017, the 202,476 acres (316 sq mi) region was designated as Petaluma Gap AVA with an effective date of January 8, 2018. 38°15′02″N 122°41′59″W  /  38.25055°N 122.69969°W  / 38.25055; -122.69969 Microclimate A microclimate (or micro-climate )

1173-422: A property owner and a local government to rezone a property in exchange for a commitment from the developer. It typically involves loosening restrictions on how the property can be used. Contract zoning is controversial and sometimes prohibited because it deviates from the broader planning process and has been considered an illegal bargaining away of the government's police powers to enforce zoning. Fiscal zoning

1242-418: A quasi-judicial process that enables land uses that, because of their special nature, may be suitable only in certain locations, or when arranged or operated in a particular manner. Uses which might be disallowed under current zoning, such as a school or a community center, can be permitted via conditional-use permits. Contract zoning is a controversial practice in which there is a bilateral agreement between

1311-425: A reduction in lot sizes. The term planned unit development (PUD) can refer either to the regulatory process or to the development itself. A PUD groups multiple compatible land uses within a single unified development. A PUD can be residential, mixed-use, or a larger master-planned community. Rather than being governed by standard zoning ordinances, the developer negotiates terms with the local government. At best,

1380-593: A single space. Mixed-use zoning can be vertical, within a single building, or horizontal, involving multiple buildings. Planning and community activist Jane Jacobs wrote extensively on the connections between the separation of uses and the failure of urban renewal projects in New York City. She advocated dense mixed-use developments and walkable streets . In contrast to villages and towns, in which many residents know one another, and low-density outer suburbs that attract few visitors, cities and inner city areas have

1449-444: A single use (e.g. residential , industrial ), they may combine several compatible activities by use, or in the case of form-based zoning, the differing regulations may govern the density, size and shape of allowed buildings whatever their use. The planning rules for each zone determine whether planning permission for a given development may be granted. Zoning may specify a variety of outright and conditional uses of land. It may indicate

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1518-688: A small growing region for crops that cannot thrive in the broader area; this concept is often used in permaculture practiced in northern temperate climates. Microclimates can be used to the advantage of gardeners who carefully choose and position their plants. Cities often raise the average temperature by zoning , and a sheltered position can reduce the severity of winter. Roof gardening , however, exposes plants to more extreme temperatures in both summer and winter. In an urban area, tall buildings create their own microclimate, both by overshadowing large areas and by channeling strong winds to ground level. Wind effects around tall buildings are assessed as part of

1587-531: A system of use-based districts. Performance zoning is flexible, logical, and transparent while offering a form of accountability. These qualities are in contrast with the seemingly arbitrary nature of use-based zoning. Performance zoning can also fairly balance a region's environmental and housing needs across local jurisdictions. Performance zoning balances principles of markets and private property rights with environmental protection goals. However, performance zoning can be extremely difficult to implement due to

1656-576: Is Adelaide in South Australia , whose city centre, along with the suburb of North Adelaide , is surrounded on all sides by a park, the Adelaide Park Lands . The park was designed by Colonel William Light in 1836 in order to physically separate the city centre from its suburbs. Low density residential areas surround the park, providing a pleasant walk between work in the city within and the family homes outside. Sir Ebenezer Howard , founder of

1725-434: Is a broad term that consists of several alternatives to use-based zoning that incorporate information and communication technologies. There are a number of different techniques to accomplish smart zoning. Floating zones, cluster zoning, and planned unit developments (PUDs) are possible—even as the conventional use-based code exists —or the conventional code may be completely replaced by a smart performance or form-based code, as

1794-425: Is a controversial practice in which a small part of a larger zoning district is rezoned in a way that is not consistent with the community's broader planning process. While a jurisdiction can rezone even a single parcel of land in some cases, spot zoning is often disallowed when the change would conflict with the policies and objectives of existing land-use plans. Other factors that may be considered in these cases are

1863-507: Is a controversial practice in which local governments use land use regulation, including zoning, to encourage land uses that generate high tax revenue and exclude uses that place a high demand on public services. Environmental activists argue that putting everyday uses out of walking distance of each other leads to an increase in traffic, since people have to own cars in order to live a normal life where their basic human needs are met, and get in their cars and drive to meet their needs throughout

1932-409: Is a local set of atmospheric conditions that differ from those in the surrounding areas, often slightly but sometimes substantially. The term may refer to areas as small as a few square meters or smaller (for example a garden bed , underneath a rock, or a cave) or as large as many square kilometers. Because climate is statistical , which implies spatial and temporal variation of the mean values of

2001-616: Is a zoning district that overlaps one or more zoning districts to address a particular concern or feature of that area, such as wetlands, historic buildings or transit-oriented development . Overlay zoning has the advantage of providing targeted regulation to address a specific issue, such as a natural hazard, without having to significantly rewrite an existing zoning ordinance. However, development of overlay zoning regulation often requires significant technical expertise. Transferable development rights, also known as transfer of development credits and transferable development units, are based on

2070-493: Is high. However, hidden costs may still offset its benefits. Incentive zoning has also been criticized for increasing traffic, reducing natural light, and offering developers larger rewards than those reaped by the public. Additional zoning provisions exist that are not their own distinct types of zoning but seek to improve existing varieties through the incorporation of flexible practices and other elements such as information and communication technologies (ICTs). Smart zoning

2139-450: Is the ability to create flexible zoning districts for smoother transitions between adjacent properties with different uses. Inclusionary zoning refers to policies to increase the number of housing units within a development that are affordable to low and middle-income households. These policies can be mandatory as part of performance zoning or based on voluntary incentives, such as allowing greater density of development. An overlay zone

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2208-428: Is used to reduce barriers to housing development, create more affordable housing, reduce burdens on permit-review staff, and create quality housing designs within a certain neighborhood or jurisdiction. Pattern zoning may also be used to promote certain building types such as missing middle housing and affordable small-scale commercial properties. In some cases, a municipality purchases design patterns and constructs

2277-723: Is where only one kind of use is allowed per zone, or district. It is also known as exclusionary zoning or, in the United States, as Euclidean zoning because of a court case in Euclid, Ohio , Village of Euclid, Ohio v. Ambler Realty Co. 272 U.S. 365 (1926), which established its constitutionality. It has been the dominant system of zoning in North America, especially the United States , since its first implementation. Commonly defined single-use districts include: residential, commercial, and industrial. Each category can have

2346-719: The Grotta Grande del Vento cave in Ancona, Italy . As pointed out by Rudolf Geiger in his book not only climate influences the living plant but the opposite effect of the interaction of plants on their environment can also take place, and is known as plant climate . This effect has important consequences for forests in the midst of a continent; indeed, if forests were not creating their own clouds and water cycle with their efficient evapotranspiration activity, there would be no forest far away from coasts, as statistically, without any other influence, rainfall occurrence would decrease from

2415-621: The New Urbanism movement. To accommodate the New Urbanist vision of walkable communities combining cafés , restaurants , offices and residential development in a single area, mixed-use zones have been created within some zoning systems. These still use the basic regulatory mechanisms of zoning, excluding incompatible uses such as heavy industry or sewage farms , while allowing compatible uses such as residential, commercial and retail activities so that people can live, work and socialise within

2484-564: The United States with the Los Angeles zoning ordinances of 1904 and the New York City 1916 Zoning Resolution . There are a great variety of zoning types, some of which focus on regulating building form and the relation of buildings to the street with mixed uses, known as form-based, others with separating land uses, known as use-based, or a combination thereof. Use-based zoning systems can comprise single-use zones, mixed-use zones - where

2553-666: The Zhou Dynasty (1046 – 256 BC), in India during the Vedic Era (1500 – 500 BC), and in the military camps that spread throughout the Roman Empire (31 BC – 476 AD). Throughout the Age of Enlightenment and Industrial Revolution , cultural and socio-economic shifts led to the rapid increase in the enforcement and invention of urban regulations. The shifts were informed by a new scientific rationality,

2622-437: The garden city movement , cited Adelaide as an example of how green open space could be used to prevent cities from expanding beyond their boundaries and coalescing. His design for an ideal city, published in his 1902 book Garden Cities of To-morrow , envisaged separate concentric rings of public buildings, parks, retail space, residential areas and industrial areas, all surrounded by open space and farmland. All retail activity

2691-624: The ability of those that wish to provide charitable housing from doing so. For example, in 2022, Gloversville's Free Methodist Church in New York wished to provide 40 beds for the homeless population in -4 degree weather and were inhibited from doing so. Corruption is a challenge for zoning. Some have argued that zoning laws increase economic inequality . Empirical effectiveness estimates show some zoning approaches can contribute to housing crisis . The legal framework for land use zoning in Australia

2760-417: The advent of mass production and complex manufacturing, and the subsequent onset of urbanisation. Industry leaving the home reshaped modern cities. The definition of home was tied to the definition of economy, which caused a much greater mixing of uses within the residential quarters of cities. Separation between uses is a feature of many planned cities designed before the advent of zoning. A notable example

2829-624: The case in London or New York. The construction of the Montparnasse Tower in 1973 led to an outcry. As a result, two years after its completion the construction of buildings over seven storeys high in the city centre was banned. Performance zoning, also known as flexible or impact zoning or effects-based planning, was first advocated by Lane Kendig in 1973. It uses performance-based or goal-oriented criteria to establish review parameters for proposed development projects. Performance zoning may use

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2898-440: The cave atmosphere, air pressure, geochemistry of the cave rock as well as the waste product from these species can combine to make unique microclimates within cave systems. The speleogenetic effect is an observed and studied process of air circulation within cave environments brought on by convection. In phreatic conditions the cave surfaces are exposed to the enclosed air (as opposed to submerged and interacting with water from

2967-482: The city of Miami did in 2019. The incorporation of ICTs to measure metrics such as walkability , and the flexibility and adaptability that smart zoning can provide, have been cited as advantages of smart zoning over "non-smart" performance or form-based codes. Floating zones describe a zoning district's characteristics and codify requirements for its establishment, but its location remains unspecified until conditions exist to implement that type of zoning district. When

3036-664: The coast towards inland. Planting trees to fight drought has also been proposed in the context of afforestation . Artificial reservoirs as well as natural ones create microclimates and often influence the macroscopic climate as well. Another contributing factor of microclimate is the slope or aspect of an area. South-facing slopes in the Northern Hemisphere and north-facing slopes in the Southern Hemisphere are exposed to more direct sunlight than opposite slopes and are therefore warmer for longer periods of time, giving

3105-415: The coastal areas stay much milder during winter months, in contrast to the hotter summers. This is the case in places such as British Columbia , where Vancouver has an oceanic wet winter with rare frosts, but inland areas that average several degrees warmer in summer have cold and snowy winters. Two main parameters to define a microclimate within a certain area are temperature and humidity . A source of

3174-452: The community's desired character and intensity of development. The French planning system is mostly form-based; zones in French cities generally allow many types of uses. The city of Paris has used its zoning system to concentrate high-density office buildings in the district of La Défense rather than allow heritage buildings across the city to be demolished to make way for them, as is often

3243-634: The complexity of preparing an impact study for each project, and can require the supervising authority to exercise a lot of discretion. Performance zoning has not been adopted widely in the US. Incentive zoning allows property developers to develop land more intensively, such as with greater density or taller buildings, in exchange for providing some public benefits, such as environmental amenities or affordable housing units. The public benefits most often incentivised by US cities are "mixed-use development, open space conservation, walkability, affordable housing, and public parks." Incentive zoning allows for

3312-427: The concept that with land ownership comes the right of use of land, or land development . These land-based development rights can, in some jurisdictions, be used, unused, sold, or otherwise transferred by the owner of a parcel. These are typically used to transfer development rights from rural areas (sending sites) to urban areas (receiving sites) with more demand and infrastructure to support development. Spot zoning

3381-514: The criteria for implementation of a floating zone are met, the floating zone ceases "to float" and its location is established by a zoning amendment. Cluster zoning permits residential uses to be clustered more closely together than normally allowed, thereby leaving substantial land area to be devoted to open space. Cluster zoning has been favored for its preservation of open space and reduction in construction and utility costs via consolidation, although existing residents may often disapprove due to

3450-538: The day. Single-use zoning and urban sprawl have also been criticized as making work–family balance more difficult to achieve, as greater distances need to be covered in order to integrate the different life domains. These issues are especially acute in the United States, with its high level of car usage combined with insufficient or poorly maintained urban rail and metro systems. Some economists claim that zoning laws work against economic efficiency, reduce responsiveness to consumer demands and hinder development in

3519-459: The describing parameters , microclimates are identified as statistically distinct conditions which occur and/or persist within a region. Microclimates can be found in most places but are most pronounced in topographically dynamic zones such as mountainous areas, islands, and coastal areas. Microclimates exist, for example, near bodies of water which may cool the local atmosphere, or in heavy urban areas where brick , concrete , and asphalt absorb

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3588-452: The distinctive form of many cities in the United States , Canada , Australia , and New Zealand , in which a very dense urban core , often containing skyscrapers , is surrounded by low density residential suburbs , characterised by large gardens and leafy streets . Some metropolitan areas such as Minneapolis–Saint Paul and Sydney have several such cores. Mixed-use zoning combines residential, commercial, office, and public uses into

3657-521: The environment within that system. Air density within caves, which directly relates to the convection processes, is determined by the air temperature, humidity, and pressure. In enclosed cave environments, the introduction of bacteria, algae, plants, animals, or human interference can change any one of these factors therefore altering the microenvironment within the cave. There are over 750 caves worldwide that are available for people to visit. The constant human traffic through these cave environments can have

3726-534: The land and allows cold, moist air, plus winds and fog to move into the area. Vineyards have been prevalent in the Petaluma Gap since the 1880s. During the 1990s, the Sonoma County wine industry adopted the term Petaluma Gap to help differentiate its products. It is a sub-region of the Sonoma Coast AVA . Wine grapes growing in the Petaluma Gap are said to be influenced enough by this climate to give its wines

3795-473: The microenvironment can be drastically enhanced. One example is the effect of the presence of hydro sulfuric acid ( H 2 S ). When the oxidized hydrosulfuric acid chemically alters to sulfuric acid( H 2 SO 4 ), this acid starts to react with the calcium carbonate rock at much higher rates. The water involved in this reaction tends to have a high pH of 3 which renders the water almost unlivable for many bacteria and algae. An example of this can be found in

3864-459: The near ground temperature. On the other hand, if soil has many air pockets, then the heat could be trapped underneath the topsoil, resulting in the increased possibility of frost at ground level. Zoning In urban planning , zoning is a method in which a municipality or other tier of government divides land into "zones", each of which has a set of regulations for new development that differs from other zones. Zones may be defined for

3933-427: The physical structure of a community in order to create more walkable and adaptable environments. Form-based zoning codes have five main elements: a regulating plan, public standards, building standards, and precise definitions of technical terms. Form-based codes recognize the interrelated nature of all components of land-use planning—zoning, subdivision, and public works—and integrate them to define districts based on

4002-423: The problem of maintaining order between strangers. This order is maintained when, throughout the day and evening, there are sufficient people present with eyes on the street . This can be accomplished in successful urban districts that have a great diversity of uses, creating interest and attracting visitors. Jacobs' writings, along with increasing concerns about urban sprawl, are often credited with inspiring

4071-513: The properties themselves while in other cases the municipality offers the patterns for private development. A hybrid zoning code combines two or more approaches, often use-based and form-based zoning. Hybrid zoning can be used to introduce form and design considerations into an existing community's zoning without completely rewriting the zoning ordinance. Composite zoning is a particular type of hybrid zoning that combines use, form, and site design components: An advantage of composite zoning

4140-552: The size and dimensions of lots that land may be subdivided into, or the form and scale of buildings. These guidelines are set in order to guide urban growth and development. Zoning is the most common regulatory urban planning method used by local governments in developed countries. Exceptions include the United Kingdom and the City of Houston , Texas . Most zoning systems have a procedure for granting variances (exceptions to

4209-621: The size of the parcel, the zoning categories involved, how adjacent properties are zoned and used, and expected benefits and harms to the landowner, neighbors, and community. Conditional zoning is a legislative process in which site-specific standards and conditions become part of the zoning ordinance at the request of the property owner. The conditions may be more or less restrictive than the standard zoning. Conditional zoning can be considered spot zoning and can be challenged on those grounds. Conditional zoning should not be confused with conditional-use permits (also called special-use permits ),

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4278-422: The slope a warmer microclimate than the areas around the slope. The lowest area of a glen may sometimes frost sooner or harder than a nearby spot uphill, because cold air sinks, a drying breeze may not reach the lowest bottom, and humidity lingers and precipitates , then freezes . The type of soil found in an area can also affect microclimates. For example, soils heavy in clay can act like pavement, moderating

4347-451: The sun's energy, heat up, and re-radiate that heat to the ambient air: the resulting urban heat island (UHI) is a kind of microclimate that is additionally driven by relative paucity of vegetation . The terminology "micro-climate" first appeared in the 1950s in publications such as Climates in Miniature: A Study of Micro-Climate Environment (Thomas Bedford Franklin, 1955). The area in

4416-448: The threshold wind speed. The presence of permafrost close to the surface in a crater creates a unique microclimate environment. Caves are important geologic formations that can house unique and delicate geologic/biological environments. The vast majority of caves found are made of calcium carbonates such as limestone . In these dissolution environments, many species of flora and fauna find home. The mixture of water content within

4485-472: The walls is where unsanitary and dangerous activities occurred such as butchering, waste disposal, and brick-firing. Within the walls were civic and religious places, and where the majority of people lived. Beyond distinguishing between urban and non-urban land, most ancient cities further classified land types and uses inside their walls. This was practiced in many regions of the world – for example, in China during

4554-492: The water table in vadose conditions). This air circulates water particles that condense on cave walls and formations such as speleothems . This condensing water has been found to contribute to cave wall erosion and the formation of morphological features. Some examples of this can be found in the limestone walls of Grotta Giusti ; a thermal cave near Monsummano , Lucca, Italy. Any process that leads to an increase or decrease in chemical/physical processes will subsequently impact

4623-592: The wind speed v {\displaystyle v} in order to create a warm air flow penetration into a CAP is the following: where F r {\displaystyle \mathrm {Fr} } is the Froude number , N {\displaystyle N} — the Brunt–Väisälä frequency , h {\displaystyle h} — depth of the valley, and F r c {\displaystyle \mathrm {Fr} _{c}} — Froude number at

4692-405: The zoning rules), usually because of some perceived hardship caused by the particular nature of the property in question. The origins of zoning districts can be traced back to antiquity . The ancient walled city was the predecessor for classifying and regulating land, based on use. Outside the city walls were the undesirable functions, which were usually based on noise and smell. The space between

4761-516: Was to be conducted within a single glass-roofed building, an early concept for the modern shopping centre inspired by the Crystal Palace . However, these planned or ideal cities were static designs embodied in a single masterplan . What was lacking was a regulatory mechanism to allow the city to develop over time, setting guidelines to developers and private citizens over what could be built where. The first modern zoning systems were applied in

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