/guava/guava/src/com/google/common/collect/AbstractMapBasedMultimap.java
Collection<V> collection = map.remove( key) ;Collection<V> collection = map.get( key) ;
Collection<V> collection = map.get ( key ) ;
return true; } else { return false; } } private Collection<V> getOrCreateCollection(@ParametricNullness K key) { <extra_id_0> if (collection == null) { collection = createCollection(key); map.put(key, collection); } return collection; }