a-a a-t aaa aae aas aat aax aea aee aes aet aex as- asa ase ass ast asx at- ata ate ats att atx ax- axa axe axs axt axx eaa eae eas eat eax eea eee ees eet eex es- esa ese ess est esx eta ete ets ett etx ex- exa exe exs ext exx saa sae sas sat sax se- sea see ses set sex ss- ssa sse sss sst ssx sta ste sts stt stx sxs sxt t-x taa tae tas tat tax te- tea tee tes tet tex tsa tse tss tst tsx tta tte tts ttt ttx txe txs txt xaa xas xat xee xes xet xex xsa xss xst xts xtx xxx