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diff --git a/src/3rdparty/adaptagrams/libcola/shapepair.h b/src/3rdparty/adaptagrams/libcola/shapepair.h
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+/*
+ * vim: ts=4 sw=4 et tw=0 wm=0
+ *
+ * libcola - A library providing force-directed network layout using the 
+ *           stress-majorization method subject to separation constraints.
+ *
+ * Copyright (C) 2014  Monash University
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ * See the file LICENSE.LGPL distributed with the library.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+ *
+ * Author(s):  Michael Wybrow
+ *
+*/
+
+#ifndef COLA_SHAPEPAIR_H
+#define COLA_SHAPEPAIR_H
+
+namespace cola {
+
+// A pair of indexes.  
+// Specified unordered but stored ordered so it can be compared and 
+// stored in a set.
+//
+class ShapePair
+{
+    public:
+        ShapePair(unsigned ind1, unsigned ind2);
+        bool operator<(const ShapePair& rhs) const;
+        unsigned short index1(void) const {return m_index1;}
+        unsigned short index2(void) const {return m_index2;}
+
+    private:
+        unsigned short m_index1;
+        unsigned short m_index2;
+};
+
+
+};
+
+#endif
+