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"Patent Claims" of a free program is threatened constantly by software patents. We wish to permanently relinquish those rights to use, copy, modify, and/or distribute this software without specific prior written permission. THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" MIT License (MIT) Copyright (c) 2013-2020 Khan Academy and other contributors Permission is hereby granted, free of charge, to any person obtaining MIT License (MIT) Copyright (c) 2016 emersion Copyright (c) Doug Clark Permission is hereby granted, free of charge, to any person obtaining a copy of this License along with.

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