1-5 BBCCA2-10 CAABA11-15 BCACC16-20 dates brief regular 20 properly21-25 ACBAD26-30 BCDDB31-35 BCDAA36-40 AACDD41-45 CBADB46-50 BACCD51-55 DACBB56-60 BADAC61-65 DBCDC66-70 AB