code: public static <K, V> HashMultimap<K, V> create(Multimap<? extends K, ? extends V> multimap) {
      return new HashMultimap<>(multimap);
    }
docs: Constructs a {@code HashMultimap} with the same mappings as the specified multimap. If a
  key-value mapping appears multiple times in the input multimap, it only appears once in the
  constructed multimap.
  
  <p>This method will soon be deprecated in favor of {@code
  MultimapBuilder.hashKeys().hashSetValues().build(multimap)}.
  
  @param multimap the multimap whose contents are copied to this multimap