a-a a-t aaa aae aag aan aas aat aax aea aee aeg aen aes aet aex ag- aga age agg agn ags agt agx an- ana ane ang ann ans ant anx as- asa ase asg asn ass ast asx at- ata ate atg atn ats att atx ax- axa axe axn axs axt axx eaa eae eag ean eas eat eax eea eee eeg een ees eet eex ega ege egg egn egs egt egx en- ena ene eng enn ens ent es- esa ese esg esn ess est esx eta ete etg etn ets ett etx ex- exa exe exs ext exx gaa gae gag gan gas gat ge- gea gee geg gen ges get gex gga ggg ggn ggs ggt gna gne gnn gns gnt gsa gse gsg gsn gss gst gsx gta gte gtg gtn gts gtt gtx gxa gxs gxt naa nae nag nan nas nat nax ne- nea nee neg nen nes net nex nga nge ngg ngn ngs ngt nna nne nng nnn nns nnt nsa nse nsg nsn nss nst nsx nta nte ntg ntn nts ntt ntx nxt saa sae sag san sas sat sax se- sea see seg sen ses set sex sga sge sgg sgn sgs sgt sgx sna sne sng snn sns snt ss- ssa sse ssg ssn sss sst ssx sta ste stg stn sts stt stx sxn sxs sxt t-x taa tae tag tan tas tat tax te- tea tee teg ten tes tet tex tga tge tgg tgn tgs tgt tna tne tng tnn tns tnt tnx tsa tse tsg tsn tss tst tsx tta tte ttg ttn tts ttt ttx txe txn txs txt xaa xag xan xas xat xee xeg xen xes xet xex xge xna xns xsa xss xst xts xtx xxx