import "./lookup2bit" as lookup;

// Three-bit window lookup (2bits + signature bit) in 2bit table
// using two constraints. Maps the bits `b` to a list of constants `c`
def main(bool[3] b, field[4] c) -> field {
    field alpha = lookup([b[0], b[1]], c);
    field out = alpha - 2 * (b[2] ? alpha : 0);
    return out;
}