答案:
1-5 CADCA 6-10 CBDAB 11-15 BCADD 16-20 ABDAC 21-25 CBBCA 26-30 DBCDA 31-35 AADCB 36-40 DACBD 41-45 BCABD 46-50 BADAC 51-55 DCBBA 56-60 DCBAD 61-65 DBCDA 66-70 DABAC 71-75 ABABC 76-80 ADBCC 81-90: