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diff --git a/kaldi_io/src/tools/openfst/include/fst/invert.h b/kaldi_io/src/tools/openfst/include/fst/invert.h
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index bc83a5d..0000000
--- a/kaldi_io/src/tools/openfst/include/fst/invert.h
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@@ -1,125 +0,0 @@
-// invert.h
-
-// 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: riley@google.com (Michael Riley)
-//
-// \file
-// Functions and classes to invert an Fst.
-
-#ifndef FST_LIB_INVERT_H__
-#define FST_LIB_INVERT_H__
-
-#include <fst/arc-map.h>
-#include <fst/mutable-fst.h>
-
-
-namespace fst {
-
-// Mapper to implement inversion of an arc.
-template <class A> struct InvertMapper {
-  InvertMapper() {}
-
-  A operator()(const A &arc) {
-    return A(arc.olabel, arc.ilabel, arc.weight, arc.nextstate);
-  }
-
-  MapFinalAction FinalAction() const { return MAP_NO_SUPERFINAL; }
-
-  MapSymbolsAction InputSymbolsAction() const { return MAP_CLEAR_SYMBOLS; }
-
-  MapSymbolsAction OutputSymbolsAction() const { return MAP_CLEAR_SYMBOLS;}
-
-  uint64 Properties(uint64 props) { return InvertProperties(props); }
-};
-
-
-// Inverts the transduction corresponding to an FST by exchanging the
-// FST's input and output labels. This version modifies its input.
-//
-// Complexity:
-// - Time: O(V + E)
-// - Space: O(1)
-// where V = # of states and E = # of arcs.
-template<class Arc> inline
-void Invert(MutableFst<Arc> *fst) {
-  SymbolTable *input = fst->InputSymbols() ? fst->InputSymbols()->Copy() : 0;
-  SymbolTable *output = fst->OutputSymbols() ? fst->OutputSymbols()->Copy() : 0;
-  ArcMap(fst, InvertMapper<Arc>());
-  fst->SetInputSymbols(output);
-  fst->SetOutputSymbols(input);
-  delete input;
-  delete output;
-}
-
-
-// Inverts the transduction corresponding to an FST by exchanging the
-// FST's input and output labels.  This version is a delayed Fst.
-//
-// Complexity:
-// - Time: O(v + e)
-// - Space: O(1)
-// where v = # of states visited, e = # of arcs visited. Constant
-// time and to visit an input state or arc is assumed and exclusive
-// of caching.
-template <class A>
-class InvertFst : public ArcMapFst<A, A, InvertMapper<A> > {
- public:
-  typedef A Arc;
-  typedef InvertMapper<A> C;
-  typedef ArcMapFstImpl< A, A, InvertMapper<A> > Impl;
-  using ImplToFst<Impl>::GetImpl;
-
-  explicit InvertFst(const Fst<A> &fst) : ArcMapFst<A, A, C>(fst, C()) {
-    GetImpl()->SetOutputSymbols(fst.InputSymbols());
-    GetImpl()->SetInputSymbols(fst.OutputSymbols());
-  }
-
-  // See Fst<>::Copy() for doc.
-  InvertFst(const InvertFst<A> &fst, bool safe = false)
-      : ArcMapFst<A, A, C>(fst, safe) {}
-
-  // Get a copy of this InvertFst. See Fst<>::Copy() for further doc.
-  virtual InvertFst<A> *Copy(bool safe = false) const {
-    return new InvertFst(*this, safe);
-  }
-};
-
-
-// Specialization for InvertFst.
-template <class A>
-class StateIterator< InvertFst<A> >
-    : public StateIterator< ArcMapFst<A, A, InvertMapper<A> > > {
- public:
-  explicit StateIterator(const InvertFst<A> &fst)
-      : StateIterator< ArcMapFst<A, A, InvertMapper<A> > >(fst) {}
-};
-
-
-// Specialization for InvertFst.
-template <class A>
-class ArcIterator< InvertFst<A> >
-    : public ArcIterator< ArcMapFst<A, A, InvertMapper<A> > > {
- public:
-  ArcIterator(const InvertFst<A> &fst, typename A::StateId s)
-      : ArcIterator< ArcMapFst<A, A, InvertMapper<A> > >(fst, s) {}
-};
-
-
-// Useful alias when using StdArc.
-typedef InvertFst<StdArc> StdInvertFst;
-
-}  // namespace fst
-
-#endif  // FST_LIB_INVERT_H__