BiMap<K,V>.force Put(K key, V value) Method
An alternate form of
put that silently removes any existing entry with the value
value before proceeding with the #put operation. If the bimap previously contained the provided key-value mapping, this method has no effect.
Note that a successful call to this method could cause the size of the bimap to increase by one, stay the same, or even decrease by one.
Warning: If an existing entry with this value is removed, the key for that entry is discarded and not returned.
public V forcePut(K key, V value)