a-a aaa aae aaf aak aao aas aea aee aef aek aeo aes af- afa afe aff afk afo afs aka ake akk ako aks aoa aoe aof aok aoo aos as- asa ase asf ask aso ass eaa eae eaf eak eao eas eea eee eef eek eeo ees ef- efa efe eff efo efs eka eke ekf eko eks eo- eoa eoe eof eok eoo eos es- esa ese esf esk eso ess faa fae faf fak fao fas fea fee fef fek feo fes ffa ffe fff ffk ffo ffs fka fkf fkk foa foe fof fok foo fos fsa fse fsf fsk fso fss ka- kaa kae kaf kak kao kas ke- kea kee kef kek keo kes kfa kff kfo kfs kke kkk kks koa koe kof kok koo kos ksa kse ksf ksk kso kss oaa oae oaf oak oao oas oea oee oef oeo oes of- ofa ofe off ofo ofs oka oke okk oko oks oo- ooa oof ook ooo oos os- osa ose osf osk oso oss saa sae saf sak sao sas se- sea see sef sek seo ses sfa sfe sff sfk sfo sfs sk- ska ske skf skk sko sks soa soe sof sok soo sos ss- ssa sse ssf ssk sso sss