a-a a-b a-t aaa aab aag aao aas aat aay ab- aba abb abg abo abs abt aby ag- aga agb agg ago ags agt agy aoa aob aog aoo aos aot as- asa asb asg aso ass ast asy at- ata atb atg ato ats att ay- aya ayo ays ayt baa bab bag bao bas bat bay bba bbb bbg bbo bbs bbt bby bga bgb bgg bgo bgs bgt boa bob bog boo bos bot boy bsa bsb bsg bso bss bst bsy bta btb btg bto bts btt bty by- bya byg byo bys byt gaa gab gag gao gas gat gay gba gbg gbo gbs gbt gby gga ggb ggg ggo ggs ggt goa gob gog goo gos got goy gsa gsb gsg gso gss gst gta gtb gtg gto gts gtt gty gy- gya gyb gyo gys oaa oab oag oao oas oat ob- oba obb obg obo obs obt oby oga ogg ogo ogs ogt ogy oo- ooa oob oog ooo oos oot os- osa osb osg oso oss ost ot- ota otb otg oto ots ott oya oyo oys saa sab sag sao sas sat say sba sbb sbg sbo sbs sbt sby sga sgb sgg sgo sgs sgt soa sob sog soo sos sot soy ss- ssa ssb ssg sso sss sst sta stb stg sto sts stt sty sy- sya syb syg sys syt taa tab tag tao tas tat tay tba tbb tbg tbo tbs tbt tga tgb tgg tgo tgs tgt tgy to- toa tob tog too tos tot toy tsa tsb tsg tso tss tst tsy tta ttb ttg tto tts ttt tty tya tyg tyo tys tyt yaa yab yag yao yas yat yay ybg ybs yby yga ygo yob yog yoo yos yot yoy ysa ysb ysg yso yss yst ysy yta yto yts ytt yyb yyg yys yyt yyy