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diff --git a/src/utils/alphabet_mapper_none.h b/src/utils/alphabet_mapper_none.h
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+/* alphabet_mapper_none.h
+ * Copyright (C) 2008, Francisco Claude, all rights reserved.
+ *
+ * static_bitsequence 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 _ALPHABET_MAPPER_NONE_H
+#define _ALPHABET_MAPPER_NONE_H
+
+#include <basics.h>
+#include <iostream>
+#include <alphabet_mapper.h>
+
+//using namespace std;
+
+/** Mapper that doesn't change the value (identity)
+ * 
+ *  @author Francisco Claude
+ */
+class alphabet_mapper_none : public alphabet_mapper {
+  public:
+    alphabet_mapper_none();
+    virtual ~alphabet_mapper_none() {}
+    virtual uint map(uint s);
+    virtual uint unmap(uint s);
+    virtual uint size();
+    virtual uint save(FILE *fp);
+    static alphabet_mapper_none * load(FILE *fp);
+};
+
+#endif /* _ALPHABET_MAPPER_NONE_H */