a-a a-b aaa aab aag aak aao aay ab- aba abb abg abk abo aby ag- aga agb agg agk ago agy aka akb akg akk ako aoa aob aog aok aoo ay- aya ayk ayo baa bab bag bak bao bay bba bbb bbg bbk bbo bby bga bgb bgg bgk bgo bka bkb bkg bkk bko boa bob bog bok boo boy by- bya byg byk byo gaa gab gag gak gao gay gba gbg gbk gbo gby gga ggb ggg ggo gka gkb gko goa gob gog gok goo goy gy- gya gyb gyo ka- kaa kab kag kak kao kay kba kbb kbk kbo kga kgb kgo kgy kkb kkk kky koa kob kog kok koo koy kya kyo oaa oab oag oak oao ob- oba obb obg obk obo oby oga ogg ogo ogy oka okb okg okk oko oo- ooa oob oog ook ooo oya oyo yaa yab yag yak yao yay ybg yby yga ygo yka ykk yob yog yok yoo yoy yyb yyg yyy