public static $yy_lookahead     = array(
        7, 8, 9, 10, 11, 12, 5, 23, 15, 16,
        20, 21, 2, 23, 4, 17, 18, 14, 17, 18,
        13, 14, 25, 26, 15, 2, 17, 3, 3, 17,
        25, 25, 6, 1, 23, 27, 22, 24,