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diff --git a/gr-blocks/lib/patterned_interleaver_impl.h b/gr-blocks/lib/patterned_interleaver_impl.h
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+++ b/gr-blocks/lib/patterned_interleaver_impl.h
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+/* -*- c++ -*- */
+/*
+ * Copyright 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_PATTERNED_INTERLEAVER_IMPL_H
+#define INCLUDED_PATTERNED_INTERLEAVER_IMPL_H
+
+#include <blocks/patterned_interleaver.h>
+#include <boost/foreach.hpp>
+
+namespace gr {
+  namespace blocks {
+
+    class BLOCKS_API patterned_interleaver_impl : public patterned_interleaver
+    {
+    public:
+      patterned_interleaver_impl(size_t itemsize, std::vector<int> pattern);
+
+      int general_work(int noutput_items,
+	       gr_vector_int &ninput_items,
+	       gr_vector_const_void_star &input_items,
+	       gr_vector_void_star &output_items);
+
+      int pattern_max(std::vector<int> pattern){
+        int mval(0);
+        BOOST_FOREACH( int i, pattern)
+            { mval = std::max(mval, i); }
+        return mval;
+        }
+
+      void forecast (int noutput_items,
+             gr_vector_int &ninput_items_required);
+
+      std::vector<int> d_pattern;
+      std::vector<int> d_counts;
+      size_t d_itemsize;
+
+    };
+
+  } /* namespace blocks */
+} /* namespace gr */
+
+#endif