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diff --git a/libcds/src/static_sequence/static_sequence.cpp b/libcds/src/static_sequence/static_sequence.cpp
index 7f9fde2..e97a112 100644
--- a/libcds/src/static_sequence/static_sequence.cpp
+++ b/libcds/src/static_sequence/static_sequence.cpp
@@ -1,16 +1,43 @@
-
+/* static_sequence.cpp
+ * Copyright (C) 2008, Francisco Claude, all rights reserved.
+ *
+ * static_sequence definition
+ *
+ * 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 <static_sequence.h>
 
 static_sequence::static_sequence() {}
 static_sequence::~static_sequence() {}
 uint static_sequence::length() { return len; }
 
+uint static_sequence::count(uint s) {
+  return rank(s,len-1);
+}
+
 static_sequence * static_sequence::load(FILE * fp) {
   uint rd;
   if(fread(&rd,sizeof(uint),1,fp)!=1) return NULL;
   fseek(fp,-sizeof(uint),SEEK_CUR);
   switch(rd) {
     case WVTREE_HDR: return static_sequence_wvtree::load(fp);
+    case GMR_CHUNK_HDR: return static_sequence_gmr_chunk::load(fp);
+    case GMR_HDR: return static_sequence_gmr::load(fp);
+    case WVTREE_NOPTRS_HDR: return static_sequence_wvtree_noptrs::load(fp);
   }
   return NULL;
 }