a-a a-b aaa aab aaf aag aah aak aar aas ab- aba abb abf abg abh abk abr abs af- afa afb aff afg afh afk afr afs ag- aga agb agf agg agh agk agr ags aha ahb ahf ahg ahh ahk ahr ahs aka akb akg akh akk akr aks ar- ara arb arf arg arh ark arr ars as- asa asb asf asg ash ask asr ass baa bab baf bag bah bak bar bas bba bbb bbf bbg bbh bbk bbr bbs bfa bfb bff bfg bfh bfr bfs bga bgb bgf bgg bgh bgk bgr bgs bha bhb bhf bhg bhh bhk bhr bhs bka bkb bkf bkg bkk bkr bks bra brb brf brg brh brk brr brs bsa bsb bsf bsg bsh bsk bsr bss faa fab faf fag fah fak far fas fba fbb fbf fbg fbh fbk fbr fbs ffa fff ffg ffh ffk ffr ffs fga fgb fgf fgg fgh fgr fgs fha fhb fhf fhg fhh fhr fhs fka fkb fkf fkg fkk fra frb frf frg frh frk frr frs fsa fsb fsf fsg fsh fsk fsr fss gaa gab gaf gag gah gak gar gas gba gbf gbg gbh gbk gbr gbs gfa gfb gff gfh gfk gfr gfs gga ggb ggg ggh ggr ggs gha ghb ghg ghh ghr ghs gka gkb gkh gks gra grb grf grg grh grk grr grs gsa gsb gsf gsg gsk gsr gss haa hab haf hag hah hak har has hba hbb hbf hbg hbh hbk hbr hbs hfa hfb hff hfg hfh hfk hfr hfs hga hgb hgf hgg hgh hgk hgr hgs hha hhb hhf hhg hhh hhk hhr hhs hka hkb hkf hkg hkh hkk hkr hks hr- hra hrb hrf hrg hrh hrk hrr hrs hsa hsb hsf hsg hsh hsk hsr hss ka- kaa kab kaf kag kah kak kar kas kba kbb kbf kbh kbk kbr kbs kfa kff kfg kfh kfs kga kgb kgf kgh kgs kha khf khh khk khr khs kkb kkh kkk kkr kks kra krf krg krk krr krs ksa ksb ksf ksg ksh ksk ksr kss ra- raa rab raf rag rah rak rar ras rba rbb rbf rbg rbh rbk rbr rbs rfa rfb rff rfg rfh rfk rfr rfs rga rgb rgf rgg rgh rgk rgr rgs rh- rha rhb rhf rhg rhh rhr rhs rkb rkf rkg rkk rks rra rrb rrf rrg rrh rrk rrr rrs rsa rsb rsf rsg rsh rsk rsr rss saa sab saf sag sah sak sar sas sba sbb sbf sbg sbh sbk sbr sbs sfa sfb sff sfg sfh sfk sfr sfs sga sgb sgf sgg sgh sgk sgr sgs sh- sha shb shf shg shh shk shr shs sk- ska skb skf skg skh skk skr sks sr- sra srb srf srg srh srk srr srs ss- ssa ssb ssf ssg ssh ssk ssr sss