a-a a-b a-i a-t aaa aab aai aak aam aao aat ab- aba abb abi abk abm abo abt ai- aia aib aii aik aim aio ait aka akb aki akk akm ako ama amb ami amk amm amo amt aoa aob aoi aok aom aoo aot at- ata atb ati atm ato att baa bab bai bak bam bao bat bba bbb bbi bbk bbm bbo bbt bi- bia bib bii bik bim bio bit bka bkb bkk bkm bko bkt bma bmb bmi bmk bmm bmo bmt boa bob boi bok bom boo bot bta btb bti btk btm bto btt ia- iaa iab iai iam iao iat iba ibb ibi ibk ibm ibo ibt iia iib iii iim iio iit ika ikb iki ikk iko ikt im- ima imb imi imm imo imt io- ioa iob ioi iom ioo iot ita itb iti itk itm ito itt k-t ka- kaa kab kai kak kam kao kat kba kbb kbi kbk kbm kbo kia kib kii kik kim kio kit kkb kki kkk kkm kkt kma kmb kmi kmk kmm kmo kmt koa kob koi kok kom koo kot kta ktb ktk ktm kto ktt m-o maa mab mai mak mam mao mat mba mbb mbi mbk mbm mbo mbt mi- mia mib mii mik mim mio mit mka mkb mkk mkm mko mkt mma mmb mmi mmk mmm mmo mmt moa mob moi mok mom moo mot mta mtb mti mtk mtm mto mtt o-i oaa oab oai oak oam oao oat ob- oba obb obi obk obm obo obt oia oib oii oik oim oio oit oka okb oki okk oko om- oma omb omi omm omo omt oo- ooa oob ooi ook oom ooo oot ot- ota otb oti otk otm oto ott taa tab tai tak tam tao tat tba tbb tbi tbk tbm tbo tbt tia tib tii tik tim tio tit tka tkb tkk tkm tko tkt tma tmb tmi tmk tmm tmo tmt to- toa tob toi tok tom too tot tta ttb tti ttk ttm tto ttt