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diff --git a/libcds/src/static_sequence/wt_node_internal.h b/libcds/src/static_sequence/wt_node_internal.h
index df77c18..fed8e17 100644
--- a/libcds/src/static_sequence/wt_node_internal.h
+++ b/libcds/src/static_sequence/wt_node_internal.h
@@ -1,4 +1,24 @@
-
+/* 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
 
@@ -10,13 +30,21 @@
 #include <static_bitsequence_builder.h>
 #include <cassert>
 
+/** 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);
 		virtual ~wt_node_internal();
 		virtual uint rank(uint symbol, uint pos, uint level, wt_coder * c);
+		virtual uint rankLessThan(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 uint size();
     virtual uint save(FILE *fp);
     static wt_node_internal * load(FILE *fp);
@@ -30,4 +58,3 @@ class wt_node_internal: public wt_node {
 };
 
 #endif
-