code: public Opt<Suggestions> getSuggestions() {
          if (possibilities.size() <= 1) {
              // No suggestions if there are no possibilities, or if only 1 possibility.
              return Opt.absent();
          }
  
          // There are at least 2 possibilities, suggestions are available.
          final Suggestions.Builder builder = new Suggestions.Builder();
          for (Entry<String, CliValueType> entry : possibilities.entrySet()) {
              builder.addSuggestion(entry.getValue(), entry.getKey());
          }
          return Opt.of(builder.build());
      }
docs: Return suggestions based on this auto-complete object's possibilities.
  Suggestions are only possible when there are multiple auto-complete possibilities (1 or more).
  
  @return A {@code present} value when suggestions exists for this auto-complete (there are 1 or more possibilities).