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diff --git a/src/sequence_matcher.cc b/src/sequence_matcher.cc
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+/**
+ * Copyright (c) 2007-2012, Timothy Stack
+ *
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * * Redistributions of source code must retain the above copyright notice, this
+ * list of conditions and the following disclaimer.
+ * * Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ * * Neither the name of Timothy Stack nor the names of its contributors
+ * may be used to endorse or promote products derived from this software
+ * without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ''AS IS'' AND ANY
+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE FOR ANY
+ * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "sequence_matcher.hh"
+
+#include "config.h"
+#include "spookyhash/SpookyV2.h"
+
+sequence_matcher::sequence_matcher(field_col_t& example)
+{
+    for (field_col_t::iterator col_iter = example.begin();
+         col_iter != example.end();
+         ++col_iter)
+    {
+        std::string first_value;
+        field sf;
+
+        sf.sf_value = *col_iter;
+        for (field_row_t::iterator row_iter = (*col_iter).begin();
+             row_iter != (*col_iter).end();
+             ++row_iter)
+        {
+            if (row_iter == (*col_iter).begin()) {
+                first_value = *row_iter;
+            } else if (first_value != *row_iter) {
+                sf.sf_type = FT_CONSTANT;
+            }
+        }
+        if (sf.sf_type == FT_VARIABLE) {
+            sf.sf_value.clear();
+        }
+        this->sm_fields.push_back(sf);
+    }
+    this->sm_count = example.front().size();
+}
+
+void
+sequence_matcher::identity(const std::vector<std::string>& values, id_t& id_out)
+{
+    SpookyHash context;
+    int lpc = 0;
+
+    context.Init(0, 0);
+    for (std::list<field>::iterator iter = sm_fields.begin();
+         iter != sm_fields.end();
+         ++iter, lpc++)
+    {
+        if (iter->sf_type == FT_VARIABLE) {
+            context.Update(values[lpc].c_str(), values[lpc].length() + 1);
+        }
+    }
+    context.Final(id_out.out(0), id_out.out(1));
+}