a-a a-b a-i a-t aaa aab aai aak aao aat aay ab- aba abb abi abk abo abt aby ai- aia aib aii aik aio ait aiy aka akb aki akk ako aoa aob aoi aok aoo aot at- ata atb ati ato att ay- aya ayi ayk ayo ayt baa bab bai bak bao bat bay bba bbb bbi bbk bbo bbt bby bi- bia bib bii bik bio bit biy bka bkb bkk bko bkt boa bob boi bok boo bot boy bta btb bti btk bto btt bty by- bya byi byk byo byt ia- iaa iab iai iao iat iba ibb ibi ibk ibo ibt iby iia iib iii iio iit ika ikb iki ikk iko ikt io- ioa iob ioi ioo iot ita itb iti itk ito itt ity iya iyo iyt iyy k-t ka- kaa kab kai kak kao kat kay kba kbb kbi kbk kbo kia kib kii kik kio kit kkb kki kkk kkt kky koa kob koi kok koo kot koy kta ktb ktk kto ktt kya kyo kyt o-i oaa oab oai oak oao oat ob- oba obb obi obk obo obt oby oia oib oii oik oio oit oka okb oki okk oko oo- ooa oob ooi ook ooo oot ot- ota otb oti otk oto ott oya oyi oyo taa tab tai tak tao tat tay tba tbb tbi tbk tbo tbt tia tib tii tik tio tit tiy tka tkb tkk tko tkt tky to- toa tob toi tok too tot toy tta ttb tti ttk tto ttt tty tya tyo tyt yaa yab yai yak yao yat yay ybi yby yii yio yit yka yki ykk yob yoi yok yoo yot yoy yta ytk yto ytt yyb yyt yyy