AP BQ CR DS ET FU
AP-BQ-CR-DS-ET-FU
AO BP CQ DR ES FT GU
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AN BO CP DQ ER FS GT HU
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AM BN CO DP EQ FR GS HT IU
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AL BM CN DO EP FQ GR HS IT JU
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AK BL CM DN EO FP GQ HR IS JT KU
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AJ BK CL DM EN FO GP HQ IR JS KT LU
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AI BJ CK DL EM FN GO HP IQ JR KS LT MU
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AH BI CJ DK EL FM GN HO IP JQ KR LS MT NU
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AG BH CI DJ EK FL GM HN IO JP KQ LR MS NT OU
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AF BG CH DI EJ FK GL HM IN JO KP LQ MR NS OT PU
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AE BF CG DH EI FJ GK HL IM JN KO LP MQ NR OS PT QU
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AD BE CF DG EH FI GJ HK IL JM KN LO MP NQ OR PS QT RU
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AC BD CE DF EG FH GI HJ IK JL KM LN MO NP OQ PR QS RT SU
AC-BD-CE-DF-EG-FH-GI-HJ-IK-JL-KM-LN-MO-NP-OQ-PR-QS-RT-SU
AB BC CD DE EF FG GH HI IJ JK KL LM MN NO OP PQ QR RS ST TU
AB-BC-CD-DE-EF-FG-GH-HI-IJ-JK-KL-LM-MN-NO-OP-PQ-QR-RS-ST-TU