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diff --git a/lucene-java-3.5.0/lucene/contrib/spellchecker/src/java/org/apache/lucene/search/spell/StringDistance.java b/lucene-java-3.5.0/lucene/contrib/spellchecker/src/java/org/apache/lucene/search/spell/StringDistance.java
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+++ b/lucene-java-3.5.0/lucene/contrib/spellchecker/src/java/org/apache/lucene/search/spell/StringDistance.java
@@ -0,0 +1,35 @@
+package org.apache.lucene.search.spell;
+
+/**
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You 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.
+ */
+
+/**
+ * Interface for string distances.
+ */
+public interface StringDistance {
+
+  /**
+   * Returns a float between 0 and 1 based on how similar the specified strings are to one another.  
+   * Returning a value of 1 means the specified strings are identical and 0 means the
+   * string are maximally different.
+   * @param s1 The first string.
+   * @param s2 The second string.
+   * @return a float between 0 and 1 based on how similar the specified strings are to one another.
+   */
+  public float getDistance(String s1,String s2);
+  
+}