a-a a-b a-t aaa aab aam aao aat aay ab- aba abb abm abo abt aby ama amb amm amo amt amy aoa aob aom aoo aot at- ata atb atm ato att ay- aya ayo ayt baa bab bam bao bat bay bba bbb bbm bbo bbt bby bma bmb bmm bmo bmt boa bob bom boo bot boy bta btb btm bto btt bty by- bya bym byo byt m-o maa mab mam mao mat may mba mbb mbm mbo mbt mma mmb mmm mmo mmt moa mob mom moo mot moy mta mtb mtm mto mtt my- mya myb mym myo myt oaa oab oam oao oat ob- oba obb obm obo obt oby om- oma omb omm omo omt omy oo- ooa oob oom ooo oot ot- ota otb otm oto ott oya oyo taa tab tam tao tat tay tba tbb tbm tbo tbt tma tmb tmm tmo tmt tmy to- toa tob tom too tot toy tta ttb ttm tto ttt tty tya tym tyo tyt yaa yab yam yao yat yay ybm yby yma ymm ymo ymt yob yom yoo yot yoy yta ytm yto ytt yyb yyt yyy