a-a a-b a-t aaa aab aak aam aao aat ab- aba abb abk abm abo abt aka akb akk akm ako ama amb amk amm amo amt aoa aob aok aom aoo aot at- ata atb atm ato att baa bab bak bam bao bat bba bbb bbk bbm bbo bbt bka bkb bkk bkm bko bkt bma bmb bmk bmm bmo bmt boa bob bok bom boo bot bta btb btk btm bto btt k-t ka- kaa kab kak kam kao kat kba kbb kbk kbm kbo kkb kkk kkm kkt kma kmb kmk kmm kmo kmt koa kob kok kom koo kot kta ktb ktk ktm kto ktt m-o maa mab mak mam mao mat mba mbb mbk mbm mbo mbt mka mkb mkk mkm mko mkt mma mmb mmk mmm mmo mmt moa mob mok mom moo mot mta mtb mtk mtm mto mtt oaa oab oak oam oao oat ob- oba obb obk obm obo obt oka okb okk oko om- oma omb omm omo omt oo- ooa oob ook oom ooo oot ot- ota otb otk otm oto ott taa tab tak tam tao tat tba tbb tbk tbm tbo tbt tka tkb tkk tkm tko tkt tma tmb tmk tmm tmo tmt to- toa tob tok tom too tot tta ttb ttk ttm tto ttt