code: public boolean remove(K key, V value) {
  		key = sanitizeKey(key);
  		List<V> values = map.get(key);
  		if (values == null) {
  			return false;
  		}
  
  		boolean success = values.remove(value);
  		if (values.isEmpty()) {
  			map.remove(key);
  		}
  		return success;
  	}
docs: Removes a particular value.
  @param key the key
  @param value the value to remove
  @return true if the multimap contained the value, false if not