code: public static void acceptsNodeMultiple(OptionParser parser) {
          parser.acceptsAll(Arrays.asList(OPT_N, OPT_NODE), "node id list")
                .withRequiredArg()
                .describedAs("node-id-list")
                .withValuesSeparatedBy(',')
                .ofType(Integer.class);
      }
docs: Adds OPT_N | OPT_NODE option to OptionParser, with multiple arguments.
  
  @param parser OptionParser to be modified
  @param required Tells if this option is required or optional