-er a-a a-i a-t aaa aae aag aai aar aas aat aax aea aee aeg aei aer aes aet aex ag- aga age agg agi agr ags agt agx ai- aia aie aig aii air ais ait aix ar- ara are arg ari arr ars art arx as- asa ase asg asi asr ass ast asx at- ata ate atg ati atr ats att atx ax- axa axe axi axr axs axt axx eaa eae eag eai ear eas eat eax eea eee eeg eer ees eet eex ega ege egg egi egr egs egt egx eia eie eig eii eir eis eit eix era ere erg eri err ers ert es- esa ese esg esi esr ess est esx eta ete etg eti etr ets ett etx ex- exa exe exi exr exs ext exx gaa gae gag gai gar gas gat ge- gea gee geg gei ger ges get gex gga ggg ggi ggr ggs ggt gia gie gig gii gir gis git gra gre grg gri grr grs grt grx gsa gse gsg gsi gsr gss gst gsx gta gte gtg gti gtr gts gtt gtx gxa gxs gxt ia- iaa iae iag iai iar ias iat ie- iea iee ieg iei ier ies iet iex iga ige igg igi igr igs igt iia iie iii iir iis iit iix ir- ira ire irg iri irr irs irt irx is- isa ise isg isi isr iss ist ita ite itg iti its itt itx ixe ixi ra- raa rae rag rai rar ras rat rax re- rea ree reg rei rer res ret rex rga rge rgg rgi rgr rgs rgt rgx ria rie rig rii rir ris rit rix rra rrg rri rrr rrs rrt rsa rse rsg rsi rsr rss rst rsx rta rte rtg rti rtr rts rtt rtx rxr rxs saa sae sag sai sar sas sat sax se- sea see seg sei ser ses set sex sga sge sgg sgi sgr sgs sgt sgx sia sie sig sii sir sis sit six sr- sra sre srg sri srr srs srt srx ss- ssa sse ssg ssi ssr sss sst ssx sta ste stg sti str sts stt stx sxi sxs sxt t-x taa tae tag tai tar tas tat tax te- tea tee teg tei ter tes tet tex tga tge tgg tgi tgr tgs tgt tia tie tig tii tir tis tit tix tra tre trg tri trr trs trt trx tsa tse tsg tsi tsr tss tst tsx tta tte ttg tti ttr tts ttt ttx txe txi txs txt xaa xag xar xas xat xee xeg xer xes xet xex xge xgi xia xie xii xis xit xix xrt xrx xsa xsi xss xst xti xtr xts xtx xxi xxx