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diff --git a/gr-trellis/include/trellis/interleaver.h b/gr-trellis/include/trellis/interleaver.h
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+++ b/gr-trellis/include/trellis/interleaver.h
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+/* -*- c++ -*- */
+/*
+ * Copyright 2002,2012 Free Software Foundation, Inc.
+ *
+ * This file is part of GNU Radio
+ *
+ * GNU Radio is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3, or (at your option)
+ * any later version.
+ *
+ * GNU Radio 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with GNU Radio; see the file COPYING.  If not, write to
+ * the Free Software Foundation, Inc., 51 Franklin Street,
+ * Boston, MA 02110-1301, USA.
+ */
+
+#ifndef INCLUDED_TRELLIS_INTERLEAVER_H
+#define INCLUDED_TRELLIS_INTERLEAVER_H
+
+#include <trellis/api.h>
+#include <vector>
+
+namespace gr {
+  namespace trellis {
+
+    /*!
+     * \brief  INTERLEAVER class
+     */
+    class TRELLIS_API interleaver
+    {
+    private:
+      int d_K;
+      std::vector<int> d_INTER;
+      std::vector<int> d_DEINTER;
+
+    public:
+      interleaver();
+      interleaver(const interleaver & INTERLEAVER);
+      interleaver(int K, const std::vector<int> & INTER);
+      interleaver(const char *name);
+      interleaver(int K, int seed);
+      int K () const { return d_K; }
+      const std::vector<int> & INTER() const { return d_INTER; }
+      const std::vector<int> & DEINTER() const { return d_DEINTER; }
+      void write_interleaver_txt(std::string filename);
+    };
+
+  } /* namespace trellis */
+} /* namespace gr */
+
+#endif /* INCLUDED_TRELLIS_INTERLEAVER_H */