a-a aaa aae aaf aak aap aas aea aee aef aek aep aes af- afa afe aff afk afp afs aka ake akk akp aks ap- apa ape apf apk app aps as- asa ase asf ask asp ass eaa eae eaf eak eap eas eea eee eef eek eep ees ef- efa efe eff efp efs eka eke ekf ekp eks ep- epa epe epf epp eps es- esa ese esf esk esp ess faa fae faf fak fap fas fea fee fef fek fep fes ffa ffe fff ffk ffp ffs fka fkf fkk fkp fpa fpe fpk fpp fps fsa fse fsf fsk fsp fss ka- kaa kae kaf kak kap kas ke- kea kee kef kek kep kes kfa kff kfs kke kkk kkp kks kpa kpe kpf kpk kpp kps ksa kse ksf ksk ksp kss p-p paa pae paf pak pap pas pea pee pef pek pep pes pfa pfe pff pfk pfp pfs pka pke pkf pkp pks ppa ppe ppf ppk ppp pps ps- psa pse psf psk psp pss saa sae saf sak sap sas se- sea see sef sek sep ses sfa sfe sff sfk sfp sfs sk- ska ske skf skk skp sks spa spe spf spk spp sps ss- ssa sse ssf ssk ssp sss