a-a a-b aaa aab aag aao aar aas aav aay ab- aba abb abg abo abr abs abv aby ag- aga agb agg ago agr ags agv agy aoa aob aog aoo aor aos aov ar- ara arb arg aro arr ars arv ary as- asa asb asg aso asr ass asv asy av- ava avb avg avo avr avs avy ay- aya ayo ayr ays baa bab bag bao bar bas bav bay bba bbb bbg bbo bbr bbs bby bga bgb bgg bgo bgr bgs bgv boa bob bog boo bor bos bov boy bra brb brg bro brr brs brv bry bsa bsb bsg bso bsr bss bsv bsy bva bvb bvg bvo bvr bvs bvv by- bya byg byo byr bys gaa gab gag gao gar gas gav gay gba gbg gbo gbr gbs gbv gby gga ggb ggg ggo ggr ggs ggv goa gob gog goo gor gos gov goy gra grb grg gro grr grs grv gry gsa gsb gsg gso gsr gss gsv gva gvb gvg gvo gvr gvs gy- gya gyb gyo gyr gys oaa oab oag oao oar oas oav ob- oba obb obg obo obr obs obv oby oga ogg ogo ogs ogy oo- ooa oob oog ooo oor oos oov or- ora orb org oro orr ors orv ory os- osa osb osg oso osr oss osv ov- ova ovb ovo ovs ovv oya oyo oys ra- raa rab rag rao rar ras rav ray rba rbb rbg rbo rbr rbs rga rgb rgg rgo rgr rgs rgv roa rob rog roo ror ros rov roy rra rrb rrg rrr rrs rsa rsb rsg rso rsr rss rsv rva rvb rvg rvo rvr rvs rvv rvy ry- rya ryg ryo ryr rys ryy saa sab sag sao sar sas sav say sba sbb sbg sbo sbr sbs sbv sby sga sgb sgg sgo sgr sgs sgv soa sob sog soo sor sos sov soy sr- sra srb srg sro srr srs srv sry ss- ssa ssb ssg sso ssr sss ssv sva svb svg svo svr svs svv svy sy- sya syb syg syr sys v-a vaa vab vag vao var vas vav vay vba vbg vbo vbr vbs vbv vga vgg vgo vgr vgs voa vob vog voo vor vos vov voy vra vrb vrg vrr vrs vry vsa vsb vsg vso vsr vss vsv vva vvb vvg vvo vvr vvs vvv vyg yaa yab yag yao yar yas yav yay ybg ybr ybs yby yga ygo yob yog yoo yor yos yoy yra yrg yro yrs ysa ysb ysg yso ysr yss ysy yva yvo yvr yvy yyb yyg yys yyy