a-a a-b aaa aab aag aar aas aau aay ab- aba abb abg abr abs abu aby ag- aga agb agg agr ags agu agy ar- ara arb arg arr ars aru ary as- asa asb asg asr ass asu asy au- aua aub aug aur aus ay- aya ayr ays ayu b-u baa bab bag bar bas bau bay bba bbb bbg bbr bbs bbu bby bga bgb bgg bgr bgs bgu bra brb brg brr brs bru bry bsa bsb bsg bsr bss bsu bsy bua bub bug bur bus buu buy by- bya byg byr bys byu gaa gab gag gar gas gau gay gba gbg gbr gbs gbu gby gga ggb ggg ggr ggs ggu gra grb grg grr grs gru gry gsa gsb gsg gsr gss gsu gu- gua gub gug gur gus guu guy gy- gya gyb gyr gys ra- raa rab rag rar ras rau ray rba rbb rbg rbr rbs rbu rga rgb rgg rgr rgs rra rrb rrg rrr rrs rru rsa rsb rsg rsr rss rsu rua rub rug rur rus ruu ruy ry- rya ryg ryr rys ryu ryy saa sab sag sar sas sau say sba sbb sbg sbr sbs sbu sby sga sgb sgg sgr sgs sgu sr- sra srb srg srr srs sry ss- ssa ssb ssg ssr sss ssu sua sub sug sur sus suu suy sy- sya syb syg syr sys syu ua- uaa uab uag uar uas uau uay uba ubb ubg ubr ubs ubu uby uga ugb ugg ugr ugs ugu ur- ura urb urg urr urs uru ury usa usb usg usr uss usu uua uug uur uus uuu uys uyu yaa yab yag yar yas yau yay ybg ybr ybs yby yga yra yrg yrs yru ysa ysb ysg ysr yss ysu ysy yua yug yur yus yuu yuy yyb yyg yys yyu yyy