a-a a-b a-c a-t aaa aab aac aag aak aao aat aay ab- aba abb abc abg abk abo abt aby ac- aca acb acc acg ack aco act acy ag- aga agb agc agg agk ago agt agy aka akb akc akg akk ako aoa aob aoc aog aok aoo aot at- ata atb atc atg ato att ay- aya ayc ayk ayo ayt baa bab bac bag bak bao bat bay bba bbb bbc bbg bbk bbo bbt bby bca bcb bcc bcg bck bco bct bcy bga bgb bgc bgg bgk bgo bgt bka bkb bkc bkg bkk bko bkt boa bob boc bog bok boo bot boy bta btb btc btg btk bto btt bty by- bya byc byg byk byo byt c-- caa cab cac cag cak cao cat cay cba cbb cbc cbg cbk cbo cbt cby cca ccb ccc ccg cck cco cct cga cgb cgc cgg cgo cgt cgy cka ckb ckc cko ckt cky co- coa cob coc cog cok coo cot coy cta ctb ctc ctg ctk cto ctt cty cya cyb cyc cyg cyk cyo cyt gaa gab gac gag gak gao gat gay gba gbc gbg gbk gbo gbt gby gca gcb gcc gcg gck gco gct gga ggb ggc ggg ggo ggt gka gkb gko gkt goa gob goc gog gok goo got goy gta gtb gtc gtg gtk gto gtt gty gy- gya gyb gyo k-t ka- kaa kab kac kag kak kao kat kay kba kbb kbc kbk kbo kca kcb kcc kcg kck kct kga kgb kgc kgo kgy kkb kkc kkk kkt kky koa kob koc kog kok koo kot koy kta ktb ktc ktg ktk kto ktt kya kyc kyo kyt oaa oab oac oag oak oao oat ob- oba obb obc obg obk obo obt oby oc- oca ocb occ ocg ock oco oct oga ogc ogg ogo ogt ogy oka okb okc okg okk oko oo- ooa oob ooc oog ook ooo oot ot- ota otb otc otg otk oto ott oya oyo taa tab tac tag tak tao tat tay tba tbb tbc tbg tbk tbo tbt tca tcb tcc tcg tck tco tct tga tgb tgc tgg tgk tgo tgt tgy tka tkb tkc tkg tkk tko tkt tky to- toa tob toc tog tok too tot toy tta ttb ttc ttg ttk tto ttt tty tya tyc tyg tyo tyt yaa yab yac yag yak yao yat yay ybc ybg yby yca ycc yco ycy yga ygc ygo yka ykk yob yoc yog yok yoo yot yoy yta ytc ytk yto ytt yyb yyc yyg yyt yyy