*     ImmutableSetMultimap.of("a", 1, "a", 4, "b", -6);
   * EntryTransformer<String, Integer, String> transformer =
   *     new EntryTransformer<String, Integer, String>() {
   *       public String transformEntry(String key, Integer value) {
   *          return (value >= 0) ? key : "no" + key;
   *       }
   *     };
   * Multimap<String, String> transformed =
   *     Multimaps.transformEntries(multimap, transformer);

   *     ImmutableSetMultimap.of("a", 1, "a", 4, "b", -6);
   * EntryTransformer<String, Integer, String> transformer =
   *     new EntryTransformer<String, Integer, String>() {
   *       public String transformEntry(String key, Integer value) {
   *          return (value >= 0) ? key : "no" + key;
   *       }
   *     };
   * Multimap<String, String> transformed =
   *     Multimaps.transformEntries(multimap, transformer);