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diff --git a/common/utility/Combinadic.H b/common/utility/Combinadic.H
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+// Copyright 2008, 2009 Brady J. Garvin
+
+// This file is part of Covering Arrays by Simulated Annealing (CASA).
+
+// CASA is free software: you can redistribute it and/or modify it
+// under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+
+// CASA 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.  See the
+// GNU General Public License for more details.
+
+// You should have received a copy of the GNU General Public License
+// along with CASA.  If not, see <http://www.gnu.org/licenses/>.
+
+
+#ifndef COMBINADIC_H
+#define COMBINADIC_H
+
+#include <math.h>
+
+#include "Array.H"
+#include "PascalTriangle.H"
+
+class Combinadic {
+protected:
+  unsigned guessLastMember(unsigned encoding, unsigned cardinality);
+  std::pair<unsigned, unsigned>getLastMemberAndContribution
+    (unsigned encoding, unsigned cardinality);
+public:
+  unsigned encode(Array<unsigned>sortedSubset);
+  Array<unsigned>decode(unsigned encoding, unsigned cardinality);
+  Array<unsigned>begin(unsigned size) const;
+  void previous(Array<unsigned>sortedSubset) const;
+  void next(Array<unsigned>sortedSubset) const;
+};
+
+extern Combinadic combinadic;
+
+#endif