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diff --git a/src/include/fst/script/equivalent.h b/src/include/fst/script/equivalent.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_EQUIVALENT_H_
+#define FST_SCRIPT_EQUIVALENT_H_
+
+#include <fst/script/arg-packs.h>
+#include <fst/script/fst-class.h>
+#include <fst/equivalent.h>
+
+namespace fst {
+namespace script {
+
+typedef args::Package<const FstClass &, const FstClass &,
+                      float> EquivalentInnerArgs;
+typedef args::WithReturnValue<bool, EquivalentInnerArgs> EquivalentArgs;
+
+template<class Arc>
+void Equivalent(EquivalentArgs *args) {
+  const Fst<Arc> &fst1 = *(args->args.arg1.GetFst<Arc>());
+  const Fst<Arc> &fst2 = *(args->args.arg2.GetFst<Arc>());
+
+  args->retval = Equivalent(fst1, fst2, args->args.arg3);
+}
+
+bool Equivalent(const FstClass &fst1, const FstClass &fst2,
+                float delta = kDelta);
+
+}  // namespace script
+}  // namespace fst
+
+
+
+#endif  // FST_SCRIPT_EQUIVALENT_H_