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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)
+
+// This is an experimental push-down transducer(PDT) library. A PDT is
+// encoded as an FST, where some transitions are labeled with open or close
+// parentheses. To be interpreted as a PDT, the parentheses must balance on a
+// path.
+
+#ifndef FST_EXTENSIONS_PDT_PDTLIB_H_
+#define FST_EXTENSIONS_PDT_PDTLIB_H_
+
+#include <fst/extensions/pdt/pdt.h>
+#include <fst/extensions/pdt/compose.h>
+#include <fst/extensions/pdt/expand.h>
+#include <fst/extensions/pdt/replace.h>
+
+#endif // FST_EXTENSIONS_PDT_PDTLIB_H_