code: public static <K, V> MultiValueMap<K, V> toMultiValueMap(Map<K, List<V>> map) {
  		return new MultiValueMapAdapter<K, V>(map);
  
  	}
docs: Adapts a {@code Map<K, List<V>>} to an {@code MultiValueMap<K,V>}.
  
  @param map the map
  @return the multi-value map