a-a aaa aae aak aap aas aax aea aee aek aep aes aex aka ake akk akp aks ap- apa ape apk app aps apx as- asa ase ask asp ass asx ax- axa axe axk axp axs axx eaa eae eak eap eas eax eea eee eek eep ees eex eka eke ekp eks ep- epa epe epp eps epx es- esa ese esk esp ess esx ex- exa exe exp exs exx ka- kaa kae kak kap kas kax ke- kea kee kek kep kes kex kke kkk kkp kks kpa kpe kpk kpp kps ksa kse ksk ksp kss p-p paa pae pak pap pas pax pea pee pek pep pes pex pka pke pkp pks ppa ppe ppk ppp pps ppx ps- psa pse psk psp pss psx pxe pxk pxs saa sae sak sap sas sax se- sea see sek sep ses sex sk- ska ske skk skp sks skx spa spe spk spp sps spx ss- ssa sse ssk ssp sss ssx sxs xaa xak xap xas xee xep xes xex xke xks xpa xpe xpp xps xsa xsp xss xxp xxx