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(Eight Media) Permission is hereby granted, free of charge, to any person obtaining a copy THE SOFTWARE. Copyright (c) 2013 Dustin Sallings Permission is hereby granted, free of charge, to any person obtaining a copy THE SOFTWARE. --- GNU GENERAL PUBLIC LICENSE Version 2, June 1991 Copyright (C) 2013 Blake Smith Permission is hereby granted, free of charge, to any person obtaining a copy Copyright (c) 2013-2020 Khan Academy and other contributors Permission is hereby granted, free of charge, to any person obtaining a copy of the Software. THE SOFTWARE IS PROVIDED BY.

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