a-a a-b a-t aaa aab aag aao aar aas aat aay ab- aba abb abg abo abr abs abt aby ag- aga agb agg ago agr ags agt agy aoa aob aog aoo aor aos aot ar- ara arb arg aro arr ars art ary as- asa asb asg aso asr ass ast asy at- ata atb atg ato atr ats att ay- aya ayo ayr ays ayt baa bab bag bao bar bas bat bay bba bbb bbg bbo bbr bbs bbt bby bga bgb bgg bgo bgr bgs bgt boa bob bog boo bor bos bot boy bra brb brg bro brr brs brt bry bsa bsb bsg bso bsr bss bst bsy bta btb btg bto btr bts btt bty by- bya byg byo byr bys byt gaa gab gag gao gar gas gat gay gba gbg gbo gbr gbs gbt gby gga ggb ggg ggo ggr ggs ggt goa gob gog goo gor gos got goy gra grb grg gro grr grs grt gry gsa gsb gsg gso gsr gss gst gta gtb gtg gto gtr gts gtt gty gy- gya gyb gyo gyr gys oaa oab oag oao oar oas oat ob- oba obb obg obo obr obs obt oby oga ogg ogo ogs ogt ogy oo- ooa oob oog ooo oor oos oot or- ora orb org oro orr ors ort ory os- osa osb osg oso osr oss ost ot- ota otb otg oto otr ots ott oya oyo oys ra- raa rab rag rao rar ras rat ray rba rbb rbg rbo rbr rbs rbt rga rgb rgg rgo rgr rgs rgt roa rob rog roo ror ros rot roy rra rrb rrg rrr rrs rrt rsa rsb rsg rso rsr rss rst rta rtb rtg rto rtr rts rtt rty ry- rya ryg ryo ryr rys ryy saa sab sag sao sar sas sat say sba sbb sbg sbo sbr sbs sbt sby sga sgb sgg sgo sgr sgs sgt soa sob sog soo sor sos sot soy sr- sra srb srg sro srr srs srt sry ss- ssa ssb ssg sso ssr sss sst sta stb stg sto str sts stt sty sy- sya syb syg syr sys syt taa tab tag tao tar tas tat tay tba tbb tbg tbo tbr tbs tbt tga tgb tgg tgo tgr tgs tgt tgy to- toa tob tog too tor tos tot toy tra trb trg tro trr trs trt try tsa tsb tsg tso tsr tss tst tsy tta ttb ttg tto ttr tts ttt tty tya tyg tyo tyr tys tyt yaa yab yag yao yar yas yat yay ybg ybr ybs yby yga ygo yob yog yoo yor yos yot yoy yra yrg yro yrs yrt ysa ysb ysg yso ysr yss yst ysy yta yto ytr yts ytt yyb yyg yys yyt yyy