/guava/guava/src/com/google/common/collect/HashBiMap.java
delete( this) ;
delete ( entry ) ;
@Override public boolean remove(@CheckForNull Object o) { BiEntry<K, V> entry = seekByKey(o, smearedHash(o)); if (entry == null) { return false; } else { <extra_id_0> entry.prevInKeyInsertionOrder = null; entry.nextInKeyInsertionOrder = null; return true; } } }