a-a a-b a-c a-t aaa aab aac aam aat ab- aba abb abc abm abt ac- aca acb acc acm act ama amb amc amm amt at- ata atb atc atm att baa bab bac bam bat bba bbb bbc bbm bbt bca bcb bcc bcm bct bma bmb bmc bmm bmt bta btb btc btm btt c-- caa cab cac cam cat cba cbb cbc cbm cbt cca ccb ccc ccm cct cma cmb cmc cmm cmt cta ctb ctc ctm ctt maa mab mac mam mat mba mbb mbc mbm mbt mc- mca mcb mcc mcm mct mma mmb mmc mmm mmt mta mtb mtc mtm mtt taa tab tac tam tat tba tbb tbc tbm tbt tca tcb tcc tcm tct tma tmb tmc tmm tmt tta ttb ttc ttm ttt