{
    "comment": "Produces a reduce-reduce conflict unless using LR(1).",
    "tokens": "z d b c a",
    "start": "S",
    "bnf": {
        "S" :[ "a A c",
               "a B d",
               "b A d",
               "b B c"],
        "A" :[ "z" ],
        "B" :[ "z" ]
    }
}