public Parser explicitAlphabetType() {
        if (explicitAlphabetTypeParser == null) {
           FutureParser future = scoped("explicitAlphabetType");
           explicitAlphabetTypeParser = future;
           future.setParser(
               sequence(
                   choice(
                       literalRange(),
                       literal()
                   ),
                   star(
                       sequence(
                           token("ALSO"),
                           choice(
                               literalRange(),
                               literal()
                           )
                       )
                   )
               )
           );
        }

        return explicitAlphabetTypeParser;
    }