/guava/guava/src/com/google/common/collect/ForwardingMap.java
return delegate( ).containsKey( key) ;delegate( ).clear( ) ;
delegate ( ) .clear ( ) ;
@CheckForNull public V remove(@CheckForNull Object key) { return delegate().remove(key); } @Override public void clear() { <extra_id_0> } @Override public boolean containsKey(@CheckForNull Object key) { return delegate().containsKey(key); } @Override