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diff --git a/src/static_sequence/wt_node_internal.h b/src/static_sequence/wt_node_internal.h
new file mode 100644
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+++ b/src/static_sequence/wt_node_internal.h
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+/* wt_node_internal.h
+ * Copyright (C) 2008, Francisco Claude, all rights reserved.
+ *
+ * wt_node_internal
+ *
+ * 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.
+ *
+ * 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.  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 this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ *
+ */
+ 
+#ifndef wt_node_internal_h
+#define wt_node_internal_h
+
+#include <wt_node.h>
+#include <wt_node_leaf.h>
+#include <wt_coder.h>
+#include <basics.h>
+#include <static_bitsequence.h>
+#include <static_bitsequence_builder.h>
+#include <cassert>
+using std::vector;
+
+/** Clase for representing internal nodes  
+ * 
+ *  @author Francisco Claude
+ */
+class wt_node_internal: public wt_node {
+	public:
+		wt_node_internal(uint * seq, uint n, uint l, wt_coder * c, static_bitsequence_builder * bmb);
+		wt_node_internal(uchar * seq, uint n, uint l, wt_coder * c, static_bitsequence_builder * bmb, uint, uint *);
+		virtual ~wt_node_internal();
+		virtual uint rank(uint symbol, uint pos, uint level, wt_coder * c);
+		virtual uint rankLessThan(uint &symbol, uint pos);
+		virtual uint select(uint symbol, uint pos, uint level, wt_coder * c);
+		virtual uint access(uint pos);
+                virtual uint access(uint pos, uint &rank);
+                virtual void access(vector<int> &result, uint i, uint j, uint min, uint max, uint l, uint pivot);
+                virtual void access(vector<int> &result, uint i, uint j);
+                virtual uint access(uint i, uint j, uint min, uint max, uint l, uint pivot);
+		virtual uint size();
+    virtual uint save(FILE *fp);
+    static wt_node_internal * load(FILE *fp);
+
+		
+	protected:
+    wt_node_internal();
+		wt_node *left_child, *right_child;
+		static_bitsequence * bitmap;
+		//uint length;
+};
+
+#endif