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diff --git a/src/static_sequence/static_sequence.h b/src/static_sequence/static_sequence.h
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+/* static_sequence.h
+ * 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
+ *
+ */
+
+#ifndef _STATIC_SEQUENCE_H
+#define _STATIC_SEQUENCE_H
+
+
+#include <basics.h>
+#include <iostream>
+#include <vector>
+using std::vector;
+#define WVTREE_HDR 2
+#define GMR_CHUNK_HDR 3
+#define GMR_HDR 4
+#define WVTREE_NOPTRS_HDR 5
+#define BS_HDR 6
+
+//using namespace std;
+
+/** Base class for static sequences, contains many abstract functions, so this can't
+ *  be instantiated. 
+ * 
+ *  @author Francisco Claude
+ */
+class static_sequence {
+  
+public:
+  static_sequence();
+  virtual ~static_sequence();
+
+  /** Returns the number of occurrences of c until position i */
+  virtual uint rank(uint c, uint i)=0;
+  virtual uint rankLessThan(uint &i, uint j)
+  {
+      //assert(0); // Implemented only in static_sequence_wvtree
+      return -1;
+  }
+  
+  /** Returns the position of the i-th c 
+   * @return (uint)-1 if i=0, len if i exceeds the number of cs */
+  virtual uint select(uint c, uint i)=0;
+	virtual uint select_next(uint c, uint i);
+
+  /** Returns the i-th element */
+  virtual uint access(uint i)=0;
+  virtual uint access(uint i, uint &rank)
+  {
+      //assert(0); // Implemented only in static_sequence_wvtree
+      return -1;
+  }
+
+  // Returns all elements from interval [i, j] such that 
+  // their value is in [min, max].
+  virtual vector<int> access(uint i, uint j, uint min, uint max)
+  {
+      //assert(0); // Implemented only in static_sequence_wvtree
+      return vector<int>();
+  }
+
+  // Returns all elements from interval [i, j] 
+  virtual vector<int> accessAll(uint i, uint j)
+  {
+      //assert(0); // Implemented only in static_sequence_wvtree
+      return vector<int>();
+  }
+
+  // Counts the number of elements in interval [i,j] such that
+  // their values are in [min,max]
+  virtual uint count(uint i, uint j, uint min, uint max)
+  {
+      //assert(0); // Implemented only in static_sequence_wvtree
+      return 0;
+  }
+
+  /** Returns the length of the sequence */
+  virtual uint length();
+
+  /** Returns how many cs are in the sequence */
+  virtual uint count(uint c);
+
+  /** Returns the size of the structure in bytes */
+  virtual uint size()=0;
+
+  /** Stores the bitmap given a file pointer, return 0 in case of success */
+  virtual uint save(FILE * fp)=0;
+
+	virtual bool test(uint * seq, uint n);
+  
+  /** Reads a bitmap determining the type */
+  static static_sequence * load(FILE * fp);
+  
+protected:
+  /** Length of the bitstring */
+  uint len;
+  
+};
+
+#include <static_sequence_wvtree.h>
+#include <static_sequence_gmr_chunk.h>
+#include <static_sequence_wvtree_noptrs.h>
+#include <static_sequence_gmr.h>
+#include <static_sequence_bs.h>
+
+#endif  /* _STATIC_SEQUENCE_H */