a-a a-b a-c aaa aab aac aag aak aar aas aay ab- aba abb abc abg abk abr abs aby ac- aca acb acc acg ack acr acs acy ag- aga agb agc agg agk agr ags agy aka akb akc akg akk akr aks ar- ara arb arc arg ark arr ars ary as- asa asb asc asg ask asr ass asy ay- aya ayc ayk ayr ays baa bab bac bag bak bar bas bay bba bbb bbc bbg bbk bbr bbs bby bca bcb bcc bcg bck bcr bcs bcy bga bgb bgc bgg bgk bgr bgs bka bkb bkc bkg bkk bkr bks bra brb brg brk brr brs bry bsa bsb bsc bsg bsk bsr bss bsy by- bya byc byg byk byr bys c-- caa cab cac cag cak car cas cay cba cbb cbc cbg cbk cbr cbs cby cca ccb ccc ccg cck ccr ccs cga cgb cgc cgg cgr cgs cgy cka ckb ckc cks cky cra crb crc crg crk crr crs cry csa csb csc csg csk csr css csy cya cyb cyc cyg cyk cyr cys gaa gab gac gag gak gar gas gay gba gbc gbg gbk gbr gbs gby gca gcb gcc gcg gck gcr gcs gga ggb ggc ggg ggr ggs gka gkb gks gra grb grc grg grk grr grs gry gsa gsb gsc gsg gsk gsr gss gy- gya gyb gyr gys ka- kaa kab kac kag kak kar kas kay kba kbb kbc kbk kbr kbs kca kcb kcc kcg kck kcr kcs kga kgb kgc kgs kgy kkb kkc kkk kkr kks kky kra krc krg krk krr krs kry ksa ksb ksc ksg ksk ksr kss kya kyc kyr kys ra- raa rab rac rag rak rar ras ray rba rbb rbc rbg rbk rbr rbs rca rcb rcc rcg rcr rcs rga rgb rgc rgg rgk rgr rgs rkb rkc rkg rkk rks rky rra rrb rrc rrg rrk rrr rrs rsa rsb rsc rsg rsk rsr rss ry- rya ryc ryg ryk ryr rys ryy saa sab sac sag sak sar sas say sba sbb sbc sbg sbk sbr sbs sby sca scb scc scg sck scr scs sga sgb sgc sgg sgk sgr sgs sk- ska skb skc skg skk skr sks sky sr- sra srb src srg srk srr srs sry ss- ssa ssb ssc ssg ssk ssr sss sy- sya syb syc syg syk syr sys yaa yab yac yag yak yar yas yay ybc ybg ybr ybs yby yca ycc ycs ycy yga ygc yka ykk yra yrc yrg yrs ysa ysb ysc ysg ysk ysr yss ysy yyb yyc yyg yys yyy