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diff --git a/extern/quadriflow/3rd/lemon-1.3.1/lemon/color.cc b/extern/quadriflow/3rd/lemon-1.3.1/lemon/color.cc
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+/* -*- mode: C++; indent-tabs-mode: nil; -*-
+ *
+ * This file is a part of LEMON, a generic C++ optimization library.
+ *
+ * Copyright (C) 2003-2009
+ * Egervary Jeno Kombinatorikus Optimalizalasi Kutatocsoport
+ * (Egervary Research Group on Combinatorial Optimization, EGRES).
+ *
+ * Permission to use, modify and distribute this software is granted
+ * provided that this copyright notice appears in all copies. For
+ * precise terms see the accompanying LICENSE file.
+ *
+ * This software is provided "AS IS" with no warranty of any kind,
+ * express or implied, and with no claim as to its suitability for any
+ * purpose.
+ *
+ */
+
+///\file
+///\brief Color constants
+
+#include<lemon/color.h>
+
+namespace lemon {
+
+  const Color WHITE(1,1,1);
+
+  const Color BLACK(0,0,0);
+  const Color RED(1,0,0);
+  const Color GREEN(0,1,0);
+  const Color BLUE(0,0,1);
+  const Color YELLOW(1,1,0);
+  const Color MAGENTA(1,0,1);
+  const Color CYAN(0,1,1);
+
+  const Color GREY(0,0,0);
+  const Color DARK_RED(.5,0,0);
+  const Color DARK_GREEN(0,.5,0);
+  const Color DARK_BLUE(0,0,.5);
+  const Color DARK_YELLOW(.5,.5,0);
+  const Color DARK_MAGENTA(.5,0,.5);
+  const Color DARK_CYAN(0,.5,.5);
+
+} //namespace lemon