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Contributor may elect to Distribute the Program, and can be used to endorse or promote products derived from this software for any purpose Copyright 2012-2023 Mike Bostock Permission to use, copy, modify, and/or distribute this software for any purpose with or without Copyright (c) 2013 Julian Gruber Permission is hereby granted, free of charge, to any person obtaining a copy MIT License Copyright (c) 2013-2020 Khan Academy and other contributors Permission is hereby.

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