/guava/guava/src/com/google/common/collect/AbstractMapBasedMultimap.java
if ( ancestor != null) {
if ( collection != null ) {
return map().keySet().spliterator(); } @Override public boolean remove(@CheckForNull Object key) { int count = 0; Collection<V> collection = map().remove(key); <extra_id_0> count = collection.size(); collection.clear(); totalSize -= count; } return count > 0; }