a-a aaa aae aak aas aax aea aee aek aes aex aka ake akk aks as- asa ase ask ass asx ax- axa axe axk axs axx eaa eae eak eas eax eea eee eek ees eex eka eke eks es- esa ese esk ess esx ex- exa exe exs exx ka- kaa kae kak kas kax ke- kea kee kek kes kex kke kkk kks ksa kse ksk kss saa sae sak sas sax se- sea see sek ses sex sk- ska ske skk sks skx ss- ssa sse ssk sss ssx sxs xaa xak xas xee xes xex xke xks xsa xss xxx