public Parser erasePhrase() {
        if (erasePhraseParser == null) {
           FutureParser future = scoped("erasePhrase");
           erasePhraseParser = future;
           future.setParser(
               sequence(
                   token("ERASE"),
                   optional(
                       choice(
                           token("EOL"),
                           token("EOS")
                       )
                   )
               )
           );
        }

        return erasePhraseParser;
    }