a-a aaa aae aaf aak aao aap aas aea aee aef aek aeo aep aes af- afa afe aff afk afo afp afs aka ake akk ako akp aks aoa aoe aof aok aoo aop aos ap- apa ape apf apk apo app aps as- asa ase asf ask aso asp ass eaa eae eaf eak eao eap eas eea eee eef eek eeo eep ees ef- efa efe eff efo efp efs eka eke ekf eko ekp eks eo- eoa eoe eof eok eoo eop eos ep- epa epe epf epo epp eps es- esa ese esf esk eso esp ess faa fae faf fak fao fap fas fea fee fef fek feo fep fes ffa ffe fff ffk ffo ffp ffs fka fkf fkk fkp foa foe fof fok foo fop fos fpa fpe fpk fpo fpp fps fsa fse fsf fsk fso fsp fss ka- kaa kae kaf kak kao kap kas ke- kea kee kef kek keo kep kes kfa kff kfo kfs kke kkk kkp kks koa koe kof kok koo kop kos kpa kpe kpf kpk kpo kpp kps ksa kse ksf ksk kso ksp kss oaa oae oaf oak oao oap oas oea oee oef oeo oep oes of- ofa ofe off ofo ofp ofs oka oke okk oko okp oks oo- ooa oof ook ooo oop oos op- opa ope opf opk opo opp ops os- osa ose osf osk oso osp oss p-p paa pae paf pak pao pap pas pea pee pef pek peo pep pes pfa pfe pff pfk pfo pfp pfs pka pke pkf pko pkp pks poa poe pof pok poo pop pos ppa ppe ppf ppk ppo ppp pps ps- psa pse psf psk pso psp pss saa sae saf sak sao sap sas se- sea see sef sek seo sep ses sfa sfe sff sfk sfo sfp sfs sk- ska ske skf skk sko skp sks soa soe sof sok soo sop sos spa spe spf spk spo spp sps ss- ssa sse ssf ssk sso ssp sss