code: public JoinMatcherBuilder<V> using(final Object rule, final Object rule2,
          final Object... moreRules)
      {
          return using(parser.sequence(rule, rule2, moreRules));
      }
docs: Define the joining rule
  
  <p>Like {@link #using(Object)}, except several rules are accepted as
  arguments.</p>
  
  @param rule first rule
  @param rule2 second rule
  @param moreRules other rules
  @return a new {@link JoinMatcherBuilder}
  
  @see BaseParser#sequence(Object, Object, Object...)