Copyright (c) 2019 Reyk Floeter. All rights reserved.
Copyright (c) 2000, 2001 Markus Friedl.  All rights reserved.
Copyright (c) 2008 Alexander von Gernler.  All rights reserved.
Copyright (c) 2010,2011 Damien Miller.  All rights reserved.

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modification, are permitted provided that the following conditions
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