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* Copyright 2010, 2011 Piotr Galiszewski (piotr.galiszewski@kadu.im)
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* Copyright 2009 Wojciech Treter (juzefwt@gmail.com)
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* Copyright 2008, 2010, 2011, 2013 Rafał Malinowski (rafal.przemyslaw.malinowski@gmail.com)
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* This program is free software; you can redistribute it and/or