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diff --git a/scripts/training/phrase-extract/pcfg-common/typedef.h b/scripts/training/phrase-extract/pcfg-common/typedef.h
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+++ b/scripts/training/phrase-extract/pcfg-common/typedef.h
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+/***********************************************************************
+ Moses - statistical machine translation system
+ Copyright (C) 2006-2012 University of Edinburgh
+ 
+ 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 Street, Fifth Floor, Boston, MA  02110-1301  USA
+***********************************************************************/
+
+#pragma once
+#ifndef PCFG_TYPEDEF_H_
+#define PCFG_TYPEDEF_H_
+
+#include "numbered_set.h"
+#include "syntax_tree.h"
+
+#include <string>
+
+namespace Moses {
+namespace PCFG {
+
+typedef NumberedSet<std::string> Vocabulary;
+
+}  // namespace PCFG
+}  // namespace Moses
+
+#endif