a-a a-b a-i a-t aaa aab aai aao aat aay ab- aba abb abi abo abt aby ai- aia aib aii aio ait aiy aoa aob aoi aoo aot at- ata atb ati ato att ay- aya ayi ayo ayt baa bab bai bao bat bay bba bbb bbi bbo bbt bby bi- bia bib bii bio bit biy boa bob boi boo bot boy bta btb bti bto btt bty by- bya byi byo byt ia- iaa iab iai iao iat iba ibb ibi ibo ibt iby iia iib iii iio iit io- ioa iob ioi ioo iot ita itb iti ito itt ity iya iyo iyt iyy o-i oaa oab oai oao oat ob- oba obb obi obo obt oby oia oib oii oio oit oo- ooa oob ooi ooo oot ot- ota otb oti oto ott oya oyi oyo taa tab tai tao tat tay tba tbb tbi tbo tbt tia tib tii tio tit tiy to- toa tob toi too tot toy tta ttb tti tto ttt tty tya tyo tyt yaa yab yai yao yat yay ybi yby yii yio yit yob yoi yoo yot yoy yta yto ytt yyb yyt yyy