/guava/android/guava/src/com/google/common/collect/AbstractMapBasedMultimap.java
if ( collection == null) {   collection = createCollection( key) ;   map.put( key, collection) ; }
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public NavigableSet<K> tailSet(@ParametricNullness K fromElement, boolean inclusive) { return new NavigableKeySet(sortedMap().tailMap(fromElement, inclusive)); } } private void removeValuesForKey(@CheckForNull Object key) { Collection<V> collection = Maps.safeRemove(map, key); <extra_id_0> int count = collection.size(); collection.clear(); totalSize -= count; } } private abstract class Itr<T extends @Nullable Object> implements Iterator<T> {