public V remove(Object key) {
		V value = forward.remove(key);
		backward.remove(value);
		return value;
	}
public V remove(Object key) {
		V value = forward.remove(key);
		backward.remove(value);
		return value;
	}
public V remove ( Object key ) { V value = forward . remove ( key ) ; backward . remove ( value ) ; return value ; }
/* (non-Javadoc)
@see java.util.Map#remove(java.lang.Object)
/ * ( non - Javadoc )