src/main/java/org/wymiwyg/commons/util/collections/BidiMapImpl.java
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)