a-a a-b a-i a-t aaa aab aag aai aar aat aay ab- aba abb abg abi abr abt aby ag- aga agb agg agi agr agt agy ai- aia aib aig aii air ait aiy ar- ara arb arg ari arr art ary at- ata atb atg ati atr att ay- aya ayi ayr ayt baa bab bag bai bar bat bay bba bbb bbg bbi bbr bbt bby bga bgb bgg bgi bgr bgt bi- bia bib big bii bir bit biy bra brb brg bri brr brt bry bta btb btg bti btr btt bty by- bya byg byi byr byt gaa gab gag gai gar gat gay gba gbg gbi gbr gbt gby gga ggb ggg ggi ggr ggt gia gib gig gii gir git giy gra grb grg gri grr grt gry gta gtb gtg gti gtr gtt gty gy- gya gyb gyr ia- iaa iab iag iai iar iat iba ibb ibg ibi ibr ibt iby iga igb igg igi igr igt igy iia iib iii iir iit ir- ira irb irg iri irr irt iry ita itb itg iti itt ity iya iyr iyt iyy ra- raa rab rag rai rar rat ray rba rbb rbg rbi rbr rbt rga rgb rgg rgi rgr rgt ria rib rig rii rir rit riy rra rrb rrg rri rrr rrt rta rtb rtg rti rtr rtt rty ry- rya ryg ryr ryy taa tab tag tai tar tat tay tba tbb tbg tbi tbr tbt tga tgb tgg tgi tgr tgt tgy tia tib tig tii tir tit tiy tra trb trg tri trr trt try tta ttb ttg tti ttr ttt tty tya tyg tyr tyt yaa yab yag yai yar yat yay ybg ybi ybr yby yga yig yii yir yit yra yrg yrt yta ytr ytt yyb yyg yyt yyy