public Parser justified() {
        if (justifiedParser == null) {
           FutureParser future = scoped("justified");
           justifiedParser = future;
           future.setParser(
               sequence(
                   optional(
                       token("OUTPUT")
                   ),
                   choice(
                       token("JUSTIFIED"),
                       token("JUST")
                   ),
                   optional(
                       choice(
                           token("LEFT"),
                           token("RIGHT"),
                           token("CENTERED")
                       )
                   )
               )
           );
        }

        return justifiedParser;
    }