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BackOF Copyright 2010-2020 Mike Bostock Permission to use, copy, modify, and/or distribute this software, either in source and binary forms, with or without The MIT License Copyright (c) 2019 Federico Zivolo Permission is hereby granted, free of charge, to any person obtaining a copy of The MIT License (MIT) Copyright (c) 2017 Kevin Burke. Permission is hereby granted, free of charge, to any person obtaining a copy of The MIT License Copyright (c) 2015 Huan Du Permission is hereby granted, free of charge, to any other reason (not limited to software source code, even though third parties are not required.