a-a a-b a-c a-t aaa aab aac aam aao aat ab- aba abb abc abm abo abt ac- aca acb acc acm aco act ama amb amc amm amo amt aoa aob aoc aom aoo aot at- ata atb atc atm ato att baa bab bac bam bao bat bba bbb bbc bbm bbo bbt bca bcb bcc bcm bco bct bma bmb bmc bmm bmo bmt boa bob boc bom boo bot bta btb btc btm bto btt c-- caa cab cac cam cao cat cba cbb cbc cbm cbo cbt cca ccb ccc ccm cco cct cma cmb cmc cmm cmo cmt co- coa cob coc com coo cot cta ctb ctc ctm cto ctt m-o maa mab mac mam mao mat mba mbb mbc mbm mbo mbt mc- mca mcb mcc mcm mco mct mma mmb mmc mmm mmo mmt moa mob moc mom moo mot mta mtb mtc mtm mto mtt oaa oab oac oam oao oat ob- oba obb obc obm obo obt oc- oca ocb occ ocm oco oct om- oma omb omc omm omo omt oo- ooa oob ooc oom ooo oot ot- ota otb otc otm oto ott taa tab tac tam tao tat tba tbb tbc tbm tbo tbt tca tcb tcc tcm tco tct tma tmb tmc tmm tmo tmt to- toa tob toc tom too tot tta ttb ttc ttm tto ttt