public Parser usingOrChainingPhrase() {
        if (usingOrChainingPhraseParser == null) {
           FutureParser future = scoped("usingOrChainingPhrase");
           usingOrChainingPhraseParser = future;
           future.setParser(
               sequence(
                   choice(
                       token("USING"),
                       token("CHAINING"),
                       token("GIVING")
                   ),
                   plus(
                       choice(
                           dataReference(),
                           dataValue(),
                           dataOutput()
                       )
                   ),
                   optional(
                       repeatedPhrase()
                   )
               )
           );
        }

        return usingOrChainingPhraseParser;
    }