-er a-a a-t aaa aae aag aar aas aat aax aea aee aeg aer aes aet aex ag- aga age agg agr ags agt agx ar- ara are arg arr ars art arx as- asa ase asg asr ass ast asx at- ata ate atg atr ats att atx ax- axa axe axr axs axt axx eaa eae eag ear eas eat eax eea eee eeg eer ees eet eex ega ege egg egr egs egt egx era ere erg err ers ert es- esa ese esg esr ess est esx eta ete etg etr ets ett etx ex- exa exe exr exs ext exx gaa gae gag gar gas gat ge- gea gee geg ger ges get gex gga ggg ggr ggs ggt gra gre grg grr grs grt grx gsa gse gsg gsr gss gst gsx gta gte gtg gtr gts gtt gtx gxa gxs gxt ra- raa rae rag rar ras rat rax re- rea ree reg rer res ret rex rga rge rgg rgr rgs rgt rgx rra rrg rrr rrs rrt rsa rse rsg rsr rss rst rsx rta rte rtg rtr rts rtt rtx rxr rxs saa sae sag sar sas sat sax se- sea see seg ser ses set sex sga sge sgg sgr sgs sgt sgx sr- sra sre srg srr srs srt srx ss- ssa sse ssg ssr sss sst ssx sta ste stg str sts stt stx sxs sxt t-x taa tae tag tar tas tat tax te- tea tee teg ter tes tet tex tga tge tgg tgr tgs tgt tra tre trg trr trs trt trx tsa tse tsg tsr tss tst tsx tta tte ttg ttr tts ttt ttx txe txs txt xaa xag xar xas xat xee xeg xer xes xet xex xge xrt xrx xsa xss xst xtr xts xtx xxx