a-a a-t aaa aae aan aas aat aax aea aee aen aes aet aex an- ana ane ann ans ant anx as- asa ase asn ass ast asx at- ata ate atn ats att atx ax- axa axe axn axs axt axx eaa eae ean eas eat eax eea eee een ees eet eex en- ena ene enn ens ent es- esa ese esn ess est esx eta ete etn ets ett etx ex- exa exe exs ext exx naa nae nan nas nat nax ne- nea nee nen nes net nex nna nne nnn nns nnt nsa nse nsn nss nst nsx nta nte ntn nts ntt ntx nxt saa sae san sas sat sax se- sea see sen ses set sex sna sne snn sns snt ss- ssa sse ssn sss sst ssx sta ste stn sts stt stx sxn sxs sxt t-x taa tae tan tas tat tax te- tea tee ten tes tet tex tna tne tnn tns tnt tnx tsa tse tsn tss tst tsx tta tte ttn tts ttt ttx txe txn txs txt xaa xan xas xat xee xen xes xet xex xna xns xsa xss xst xts xtx xxx