a-a a-b aaa aab aag aak aao aar aay ab- aba abb abg abk abo abr aby ag- aga agb agg agk ago agr agy aka akb akg akk ako akr aoa aob aog aok aoo aor ar- ara arb arg ark aro arr ary ay- aya ayk ayo ayr baa bab bag bak bao bar bay bba bbb bbg bbk bbo bbr bby bga bgb bgg bgk bgo bgr bka bkb bkg bkk bko bkr boa bob bog bok boo bor boy bra brb brg brk bro brr bry by- bya byg byk byo byr gaa gab gag gak gao gar gay gba gbg gbk gbo gbr gby gga ggb ggg ggo ggr gka gkb gko goa gob gog gok goo gor goy gra grb grg grk gro grr gry gy- gya gyb gyo gyr ka- kaa kab kag kak kao kar kay kba kbb kbk kbo kbr kga kgb kgo kgy kkb kkk kkr kky koa kob kog kok koo kor koy kra krg krk kro krr kry kya kyo kyr oaa oab oag oak oao oar ob- oba obb obg obk obo obr oby oga ogg ogo ogy oka okb okg okk oko okr oo- ooa oob oog ook ooo oor or- ora orb org ork oro orr ory oya oyo ra- raa rab rag rak rao rar ray rba rbb rbg rbk rbo rbr rga rgb rgg rgk rgo rgr rkb rkg rkk rko rky roa rob rog rok roo ror roy rra rrb rrg rrk rrr ry- rya ryg ryk ryo ryr ryy yaa yab yag yak yao yar yay ybg ybr yby yga ygo yka ykk yob yog yok yoo yor yoy yra yrg yro yyb yyg yyy