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ZoKrates/zokrates_stdlib/stdlib/utils/multiplexer/lookup3bitSigned.zok

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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 * if b[2] then alpha else 0 fi
return out