-er a-a a-i a-t aaa aae aaf aai aar aas aat aax aea aee aef aei aer aes aet aex af- afa afe aff afi afr afs aft afx ai- aia aie aif aii air ais ait aix ar- ara are arf ari arr ars art arx as- asa ase asf asi asr ass ast asx at- ata ate atf ati atr ats att atx ax- axa axe axi axr axs axt axx eaa eae eaf eai ear eas eat eax eea eee eef eer ees eet eex ef- efa efe eff efi efr efs eft efx eia eie eif eii eir eis eit eix era ere erf eri err ers ert es- esa ese esf esi esr ess est esx eta ete etf eti etr ets ett etx ex- exa exe exi exr exs ext exx faa fae faf fai far fas fat fax fea fee fef fei fer fes fet fex ffa ffe fff ffi ffr ffs fft ffx fia fie fif fii fir fis fit fix fra fre frf fri frr frs frt fsa fse fsf fsi fsr fss fst fsx fta fte ftf fti ftr fts ftt ftx fxe fxi fxr fxs fxt fxx i-f ia- iaa iae iaf iai iar ias iat ie- iea iee ief iei ier ies iet iex ifa ife iff ifi ifr ifs ift ifx iia iie iif iii iir iis iit iix ir- ira ire irf iri irr irs irt irx is- isa ise isf isi isr iss ist ita ite itf iti its itt itx ixe ixi ra- raa rae raf rai rar ras rat rax re- rea ree ref rei rer res ret rex rfa rfe rff rfi rfr rfs rft ria rie rif rii rir ris rit rix rra rrf rri rrr rrs rrt rsa rse rsf rsi rsr rss rst rsx rta rte rtf rti rtr rts rtt rtx rxr rxs saa sae saf sai sar sas sat sax se- sea see sef sei ser ses set sex sfa sfe sff sfi sfr sfs sft sfx sia sie sif sii sir sis sit six sr- sra sre srf sri srr srs srt srx ss- ssa sse ssf ssi ssr sss sst ssx sta ste stf sti str sts stt stx sxi sxs sxt t-x taa tae taf tai tar tas tat tax te- tea tee tef tei ter tes tet tex tfa tfe tff tfi tfr tfs tft tfx tia tie tif tii tir tis tit tix tra tre trf tri trr trs trt trx tsa tse tsf tsi tsr tss tst tsx tta tte ttf tti ttr tts ttt ttx txe txf txi txs txt xaa xaf xar xas xat xee xer xes xet xex xfa xfe xfs xft xfx xia xie xii xis xit xix xrf xrt xrx xsa xsi xss xst xtf xti xtr xts xtx xxi xxx