code: public static ImmutableSet<UnicodeFriendlyString> unicodeFriendlySet(Iterable<String> strings) {
      final ImmutableSet.Builder<UnicodeFriendlyString> ret = ImmutableSet.builder();
  
      for (final String s : strings) {
        ret.add(unicodeFriendly(s));
      }
  
      return ret.build();
    }
docs: Applies {@link #unicodeFriendly(String)} to the contents of a set.