a-a a-b a-i a-t aaa aab aag aai aao aar aat aay ab- aba abb abg abi abo abr abt aby ag- aga agb agg agi ago agr agt agy ai- aia aib aig aii aio air ait aiy aoa aob aog aoi aoo aor aot ar- ara arb arg ari aro arr art ary at- ata atb atg ati ato atr att ay- aya ayi ayo ayr ayt baa bab bag bai bao bar bat bay bba bbb bbg bbi bbo bbr bbt bby bga bgb bgg bgi bgo bgr bgt bi- bia bib big bii bio bir bit biy boa bob bog boi boo bor bot boy bra brb brg bri bro brr brt bry bta btb btg bti bto btr btt bty by- bya byg byi byo byr byt gaa gab gag gai gao gar gat gay gba gbg gbi gbo gbr gbt gby gga ggb ggg ggi ggo ggr ggt gia gib gig gii gio gir git giy goa gob gog goi goo gor got goy gra grb grg gri gro grr grt gry gta gtb gtg gti gto gtr gtt gty gy- gya gyb gyo gyr ia- iaa iab iag iai iao iar iat iba ibb ibg ibi ibo ibr ibt iby iga igb igg igi igo igr igt igy iia iib iii iio iir iit io- ioa iob iog ioi ioo ior iot ir- ira irb irg iri iro irr irt iry ita itb itg iti ito itt ity iya iyo iyr iyt iyy o-i oaa oab oag oai oao oar oat ob- oba obb obg obi obo obr obt oby oga ogg ogi ogo ogt ogy oia oib oii oio oir oit oo- ooa oob oog ooi ooo oor oot or- ora orb org ori oro orr ort ory ot- ota otb otg oti oto otr ott oya oyi oyo ra- raa rab rag rai rao rar rat ray rba rbb rbg rbi rbo rbr rbt rga rgb rgg rgi rgo rgr rgt ria rib rig rii rio rir rit riy roa rob rog roi roo ror rot roy rra rrb rrg rri rrr rrt rta rtb rtg rti rto rtr rtt rty ry- rya ryg ryo ryr ryy taa tab tag tai tao tar tat tay tba tbb tbg tbi tbo tbr tbt tga tgb tgg tgi tgo tgr tgt tgy tia tib tig tii tio tir tit tiy to- toa tob tog toi too tor tot toy tra trb trg tri tro trr trt try tta ttb ttg tti tto ttr ttt tty tya tyg tyo tyr tyt yaa yab yag yai yao yar yat yay ybg ybi ybr yby yga ygo yig yii yio yir yit yob yog yoi yoo yor yot yoy yra yrg yro yrt yta yto ytr ytt yyb yyg yyt yyy