-er a-a a-t aaa aae aar aas aat aax aea aee aer aes aet aex ar- ara are arr ars art arx as- asa ase asr ass ast asx at- ata ate atr ats att atx ax- axa axe axr axs axt axx eaa eae ear eas eat eax eea eee eer ees eet eex era ere err ers ert es- esa ese esr ess est esx eta ete etr ets ett etx ex- exa exe exr exs ext exx ra- raa rae rar ras rat rax re- rea ree rer res ret rex rra rrr rrs rrt rsa rse rsr rss rst rsx rta rte rtr rts rtt rtx rxr rxs saa sae sar sas sat sax se- sea see ser ses set sex sr- sra sre srr srs srt srx ss- ssa sse ssr sss sst ssx sta ste str sts stt stx sxs sxt t-x taa tae tar tas tat tax te- tea tee ter tes tet tex tra tre trr trs trt trx tsa tse tsr tss tst tsx tta tte ttr tts ttt ttx txe txs txt xaa xar xas xat xee xer xes xet xex xrt xrx xsa xss xst xtr xts xtx xxx