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diff --git a/libcds/src/static_sequence/wt_node_leaf.cpp b/libcds/src/static_sequence/wt_node_leaf.cpp
index 6f6c887..02bc9cc 100644
--- a/libcds/src/static_sequence/wt_node_leaf.cpp
+++ b/libcds/src/static_sequence/wt_node_leaf.cpp
@@ -1,3 +1,23 @@
+/* wt_node_leaf.cpp
+ * Copyright (C) 2008, Francisco Claude, all rights reserved.
+ *
+ * wt_node_leaf
+ *
+ * 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
+ *
+ */
 
 #include <wt_node_leaf.h>
 
@@ -11,20 +31,37 @@ wt_node_leaf::wt_node_leaf() {}
 wt_node_leaf::~wt_node_leaf() {}
 
 uint wt_node_leaf::rank(uint symbol, uint pos, uint l, wt_coder * c) {
-	assert(symbol==this->symbol);
+	if(symbol!=this->symbol) return 0;
 	pos++;
-	assert(pos<=count);
 	return pos;
 }
 
+uint wt_node_leaf::rankLessThan(uint &symbol, uint pos, uint l, wt_coder * c) {
+//    std::cout <<"this-symbol: " << (uchar)this->symbol << ", symbol = " << (uchar)symbol << ", pos = " << pos << std::endl;
+	if(symbol > this->symbol) return -1;
+        symbol = this->symbol;
+	pos++;
+	return pos;
+}
+
+uint wt_node_leaf::rankLessThan(uint &symbol, uint pos) {
+//    std::cout <<"this-symbol: " << (uchar)this->symbol << ", symbol = " << (uchar)symbol << ", pos = " << pos << std::endl;
+    if (pos == -1)
+        return -1;
+    symbol = this->symbol;
+    pos++;
+    return pos;
+}
+
 uint wt_node_leaf::select(uint symbol, uint pos, uint l, wt_coder * c) {
-	assert(symbol==this->symbol);
-	assert(pos<=count && pos>0);
+	if(symbol!=this->symbol) return (uint)-1;
+	if(pos==0 || pos>count) return (uint)-1;
 	return pos;
 }
 
 uint wt_node_leaf::access(uint pos) {
-	assert(pos<count);
+//   std::cout <<"this-symbol: " << (uchar)this->symbol << ", pos = " << pos << std::endl;
+
 	return symbol;
 }