a-a a-b a-i a-t aaa aab aag aai aao aat aay ab- aba abb abg abi abo abt aby ag- aga agb agg agi ago agt agy ai- aia aib aig aii aio ait aiy aoa aob aog aoi aoo aot at- ata atb atg ati ato att ay- aya ayi ayo ayt baa bab bag bai bao bat bay bba bbb bbg bbi bbo bbt bby bga bgb bgg bgi bgo bgt bi- bia bib big bii bio bit biy boa bob bog boi boo bot boy bta btb btg bti bto btt bty by- bya byg byi byo byt gaa gab gag gai gao gat gay gba gbg gbi gbo gbt gby gga ggb ggg ggi ggo ggt gia gib gig gii gio git giy goa gob gog goi goo got goy gta gtb gtg gti gto gtt gty gy- gya gyb gyo ia- iaa iab iag iai iao iat iba ibb ibg ibi ibo ibt iby iga igb igg igi igo igt igy iia iib iii iio iit io- ioa iob iog ioi ioo iot ita itb itg iti ito itt ity iya iyo iyt iyy o-i oaa oab oag oai oao oat ob- oba obb obg obi obo obt oby oga ogg ogi ogo ogt ogy oia oib oii oio oit oo- ooa oob oog ooi ooo oot ot- ota otb otg oti oto ott oya oyi oyo taa tab tag tai tao tat tay tba tbb tbg tbi tbo tbt tga tgb tgg tgi tgo tgt tgy tia tib tig tii tio tit tiy to- toa tob tog toi too tot toy tta ttb ttg tti tto ttt tty tya tyg tyo tyt yaa yab yag yai yao yat yay ybg ybi yby yga ygo yig yii yio yit yob yog yoi yoo yot yoy yta yto ytt yyb yyg yyt yyy