countMulSig :: Tx -> Script -> Int -> [PubKey] -> [TxSignature] -> Int
countMulSig _ _ _ [] _  = 0
countMulSig :: Tx -> Script -> Int -> [PubKey] -> [TxSignature] -> Int
countMulSig _ _ _ [] _  = 0
countMulSig _ _ _ [] _  = 0