理論知識：1-30 BACCB DDCDD CBBAC BBBAC CDCAB CAADC
31-50 AC ABCD ABE BE BDE AE AC ABC BC AB BE ACE ABCE BCE AD AB BE CD CD AB
51-65 A ACD BC AB B D C C A BD A AB C C ABCD
31-50 AC ABCD ABE BE BDE AE AC ABC BC AB BE ACE ABCE BCE AD AB BE CD CD AB
51-65 A ACD BC AB B D C C A BD A AB C C ABCD