100 0 00 10:b1 011b 100 0a00 10b 01 b   b b a a A 0 1 1 1 0 1 0 0 0 1 0 0 , 3 4 1 2    C C C C      A  a 1 C1 0 0 C2 0 1 1 0 0 a C3 b b1 1 0 0 C4 即