How many distinct possible inputs to decode3 give the output (01)?

Decode sequence of bits using majority rule on consecutive three bit sequences 1 procedure decode3c3k-1...co: a binary string whose length is an integer multiple of 3) for i:= 0 to k-1 if exactly two or three of c3i, C3i+1, C3i+2 are set to 1 di := 1 else aj := 0 return ak-1.00