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diff --git a/src/include/fst/script/decode.h b/src/include/fst/script/decode.h
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+++ b/src/include/fst/script/decode.h
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+
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+// Copyright 2005-2010 Google, Inc.
+// Author: jpr@google.com (Jake Ratkiewicz)
+
+#ifndef FST_SCRIPT_DECODE_H_
+#define FST_SCRIPT_DECODE_H_
+
+#include <string>
+
+#include <fst/script/arg-packs.h>
+#include <fst/script/fst-class.h>
+#include <fst/encode.h>
+
+namespace fst {
+namespace script {
+
+typedef args::Package<MutableFstClass*, const string&> DecodeArgs;
+
+template<class Arc>
+void Decode(DecodeArgs *args) {
+  MutableFst<Arc> *ofst = args->arg1->GetMutableFst<Arc>();
+
+  EncodeMapper<Arc> *decoder = EncodeMapper<Arc>::Read(args->arg2, DECODE);
+  Decode(ofst, *decoder);
+
+  delete decoder;
+}
+
+void Decode(MutableFstClass *fst, const string &coder_fname);
+
+}  // namespace script
+}  // namespace fst
+
+#endif  // FST_SCRIPT_DECODE_H_