-er a-a aaa aae aaf aag aak aao aar aas aea aee aef aeg aek aeo aer aes af- afa afe aff afg afk afo afr afs ag- aga age agf agg agk ago agr ags aka ake akg akk ako akr aks aoa aoe aof aog aok aoo aor aos ar- ara are arf arg ark aro arr ars as- asa ase asf asg ask aso asr ass eaa eae eaf eag eak eao ear eas eea eee eef eeg eek eeo eer ees ef- efa efe eff efg efo efr efs ega ege egf egg ego egr egs eka eke ekf ekg eko ekr eks eo- eoa eoe eof eog eok eoo eor eos era ere erf erg erk ero err ers es- esa ese esf esg esk eso esr ess faa fae faf fag fak fao far fas fea fee fef feg fek feo fer fes ffa ffe fff ffg ffk ffo ffr ffs fga fge fgf fgg fgr fgs fka fkf fkg fkk foa foe fof fog fok foo for fos fra fre frf frg frk fro frr frs fsa fse fsf fsg fsk fso fsr fss gaa gae gaf gag gak gao gar gas ge- gea gee gef geg gek geo ger ges gfa gfe gff gfk gfo gfr gfs gga ggg ggo ggr ggs gka gko gks goa goe gof gog gok goo gor gos gra gre grf grg grk gro grr grs gsa gse gsf gsg gsk gso gsr gss ka- kaa kae kaf kag kak kao kar kas ke- kea kee kef keg kek keo ker kes kfa kff kfg kfo kfs kga kgf kgo kgs kke kkk kkr kks koa koe kof kog kok koo kor kos kra krf krg krk kro krr krs ksa kse ksf ksg ksk kso ksr kss oaa oae oaf oag oak oao oar oas oea oee oef oeg oeo oer oes of- ofa ofe off ofg ofo ofr ofs oga oge ogf ogg ogo ogs oka oke okg okk oko okr oks oo- ooa oof oog ook ooo oor oos or- ora ore orf org ork oro orr ors os- osa ose osf osg osk oso osr oss ra- raa rae raf rag rak rao rar ras re- rea ree ref reg rek reo rer res rfa rfe rff rfg rfk rfo rfr rfs rga rge rgf rgg rgk rgo rgr rgs rke rkf rkg rkk rko rks roa roe rof rog rok roo ror ros rra rrf rrg rrk rrr rrs rsa rse rsf rsg rsk rso rsr rss saa sae saf sag sak sao sar sas se- sea see sef seg sek seo ser ses sfa sfe sff sfg sfk sfo sfr sfs sga sge sgf sgg sgk sgo sgr sgs sk- ska ske skf skg skk sko skr sks soa soe sof sog sok soo sor sos sr- sra sre srf srg srk sro srr srs ss- ssa sse ssf ssg ssk sso ssr sss