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diff --git a/guava/src/com/google/common/collect/SetMultimap.java b/guava/src/com/google/common/collect/SetMultimap.java
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+/*
+ * Copyright (C) 2007 The Guava Authors
+ *
+ * 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.
+ */
+
+package com.google.common.collect;
+
+import com.google.common.annotations.GwtCompatible;
+
+import java.util.Collection;
+import java.util.Map;
+import java.util.Set;
+
+import javax.annotation.Nullable;
+
+/**
+ * A {@code Multimap} that cannot hold duplicate key-value pairs. Adding a
+ * key-value pair that's already in the multimap has no effect. See the {@link
+ * Multimap} documentation for information common to all multimaps.
+ *
+ * <p>The {@link #get}, {@link #removeAll}, and {@link #replaceValues} methods
+ * each return a {@link Set} of values, while {@link #entries} returns a {@code
+ * Set} of map entries. Though the method signature doesn't say so explicitly,
+ * the map returned by {@link #asMap} has {@code Set} values.
+ *
+ * <p>If the values corresponding to a single key should be ordered according to
+ * a {@link java.util.Comparator} (or the natural order), see the
+ * {@link SortedSetMultimap} subinterface.
+ *
+ * <p>See the Guava User Guide article on <a href=
+ * "http://code.google.com/p/guava-libraries/wiki/NewCollectionTypesExplained#Multimap">
+ * {@code Multimap}</a>.
+ *
+ * @author Jared Levy
+ * @since 2.0 (imported from Google Collections Library)
+ */
+@GwtCompatible
+public interface SetMultimap<K, V> extends Multimap<K, V> {
+  /**
+   * {@inheritDoc}
+   *
+   * <p>Because a {@code SetMultimap} has unique values for a given key, this
+   * method returns a {@link Set}, instead of the {@link java.util.Collection}
+   * specified in the {@link Multimap} interface.
+   */
+  @Override
+  Set<V> get(@Nullable K key);
+
+  /**
+   * {@inheritDoc}
+   *
+   * <p>Because a {@code SetMultimap} has unique values for a given key, this
+   * method returns a {@link Set}, instead of the {@link java.util.Collection}
+   * specified in the {@link Multimap} interface.
+   */
+  @Override
+  Set<V> removeAll(@Nullable Object key);
+
+  /**
+   * {@inheritDoc}
+   *
+   * <p>Because a {@code SetMultimap} has unique values for a given key, this
+   * method returns a {@link Set}, instead of the {@link java.util.Collection}
+   * specified in the {@link Multimap} interface.
+   *
+   * <p>Any duplicates in {@code values} will be stored in the multimap once.
+   */
+  @Override
+  Set<V> replaceValues(K key, Iterable<? extends V> values);
+
+  /**
+   * {@inheritDoc}
+   *
+   * <p>Because a {@code SetMultimap} has unique values for a given key, this
+   * method returns a {@link Set}, instead of the {@link java.util.Collection}
+   * specified in the {@link Multimap} interface.
+   */
+  @Override
+  Set<Map.Entry<K, V>> entries();
+
+  /**
+   * {@inheritDoc}
+   *
+   * <p>Though the method signature doesn't say so explicitly, the returned map
+   * has {@link Set} values.
+   */
+  @Override
+  Map<K, Collection<V>> asMap();
+
+  /**
+   * Compares the specified object to this multimap for equality.
+   *
+   * <p>Two {@code SetMultimap} instances are equal if, for each key, they
+   * contain the same values. Equality does not depend on the ordering of keys
+   * or values.
+   *
+   * <p>An empty {@code SetMultimap} is equal to any other empty {@code
+   * Multimap}, including an empty {@code ListMultimap}.
+   */
+  @Override
+  boolean equals(@Nullable Object obj);
+}