-er a-a a-i a-t aaa aae aai aar aas aat aax aea aee aei aer aes aet aex ai- aia aie aii air ais ait aix ar- ara are ari arr ars art arx as- asa ase asi asr ass ast asx at- ata ate ati atr ats att atx ax- axa axe axi axr axs axt axx eaa eae eai ear eas eat eax eea eee eer ees eet eex eia eie eii eir eis eit eix era ere eri err ers ert es- esa ese esi esr ess est esx eta ete eti etr ets ett etx ex- exa exe exi exr exs ext exx ia- iaa iae iai iar ias iat ie- iea iee iei ier ies iet iex iia iie iii iir iis iit iix ir- ira ire iri irr irs irt irx is- isa ise isi isr iss ist ita ite iti its itt itx ixe ixi ra- raa rae rai rar ras rat rax re- rea ree rei rer res ret rex ria rie rii rir ris rit rix rra rri rrr rrs rrt rsa rse rsi rsr rss rst rsx rta rte rti rtr rts rtt rtx rxr rxs saa sae sai sar sas sat sax se- sea see sei ser ses set sex sia sie sii sir sis sit six sr- sra sre sri srr srs srt srx ss- ssa sse ssi ssr sss sst ssx sta ste sti str sts stt stx sxi sxs sxt t-x taa tae tai tar tas tat tax te- tea tee tei ter tes tet tex tia tie tii tir tis tit tix tra tre tri trr trs trt trx tsa tse tsi tsr tss tst tsx tta tte tti ttr tts ttt ttx txe txi txs txt xaa xar xas xat xee xer xes xet xex xia xie xii xis xit xix xrt xrx xsa xsi xss xst xti xtr xts xtx xxi xxx