Copyright (c) 2009 Peter Stephenson
Copyright (c) 2011 Guido van Steen
Copyright (c) 2011 Suraj N. Kurapati
Copyright (c) 2011 Sorin Ionescu
Copyright (c) 2011 Vincent Guerci
Copyright (c) 2016 Geza Lore
Copyright (c) 2017 Bengt Brodersen
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