/guava/android/guava/src/com/google/common/collect/AbstractBiMap.java
return Maps.keyIterator ( entrySet ( ) .iterator ( ) ) ;
@Override public boolean retainAll(Collection<?> keysToRetain) { return standardRetainAll(keysToRetain); } @Override public Iterator<K> iterator() { <extra_id_0> } } @LazyInit @CheckForNull private transient Set<V> valueSet; @Override public Set<V> values() { Set<V> result = valueSet;