a-a a-t aaa aae aap aas aat aax aea aee aep aes aet aex ap- apa ape app aps apt apx as- asa ase asp ass ast asx at- ata ate atp ats att atx ax- axa axe axp axs axt axx eaa eae eap eas eat eax eea eee eep ees eet eex ep- epa epe epp eps ept epx es- esa ese esp ess est esx eta ete etp ets ett etx ex- exa exe exp exs ext exx p-p paa pae pap pas pat pax pea pee pep pes pet pex ppa ppe ppp pps ppt ppx ps- psa pse psp pss pst psx pt- pta pte ptp pts ptt ptx pxe pxs pxt saa sae sap sas sat sax se- sea see sep ses set sex spa spe spp sps spt spx ss- ssa sse ssp sss sst ssx sta ste stp sts stt stx sxs sxt t-x taa tae tap tas tat tax te- tea tee tep tes tet tex tpa tpe tpp tps tpt tpx tsa tse tsp tss tst tsx tta tte ttp tts ttt ttx txe txs txt xaa xap xas xat xee xep xes xet xex xpa xpe xpp xps xpt xsa xsp xss xst xtp xts xtx xxp xxx