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diff --git a/aapl/avlibasic.h b/aapl/avlibasic.h
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+/*
+ *  Copyright 2002 Adrian Thurston <thurston@complang.org>
+ */
+
+/*  This file is part of Aapl.
+ *
+ *  Aapl 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.
+ *
+ *  Aapl 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 Lesser General Public License for
+ *  more details.
+ *
+ *  You should have received a copy of the GNU Lesser General Public License
+ *  along with Aapl; if not, write to the Free Software Foundation, Inc., 59
+ *  Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+
+#ifndef _AAPL_AVLIBASIC_H
+#define _AAPL_AVLIBASIC_H
+
+#include "compare.h"
+
+/**
+ * \addtogroup avlitree 
+ * @{
+ */
+
+/**
+ * \class AvliBasic
+ * \brief Linked AVL Tree in which the entire element structure is the key.
+ *
+ * AvliBasic is a linked AVL tree that does not distinguish between the
+ * element that it contains and the key. The entire element structure is the
+ * key that is used to compare the relative ordering of elements. This is
+ * similar to the BstSet structure.
+ *
+ * AvliBasic does not assume ownership of elements in the tree. Items must be
+ * explicitly de-allocated.
+ */
+
+/*@}*/
+
+#define BASE_EL(name) name
+#define BASEKEY(name) name
+#define AVLMEL_CLASSDEF class Element, class Compare
+#define AVLMEL_TEMPDEF class Element, class Compare
+#define AVLMEL_TEMPUSE Element, Compare
+#define AvlTree AvliBasic
+#define AVL_BASIC
+#define WALKABLE
+
+#include "avlcommon.h"
+
+#undef BASE_EL
+#undef BASEKEY
+#undef AVLMEL_CLASSDEF
+#undef AVLMEL_TEMPDEF
+#undef AVLMEL_TEMPUSE
+#undef AvlTree
+#undef AVL_BASIC
+#undef WALKABLE
+
+#endif /* _AAPL_AVLIBASIC_H */