a-a a-i a-t aaa aae aaf aai aas aat aax aea aee aef aei aes aet aex af- afa afe aff afi afs aft afx ai- aia aie aif aii ais ait aix as- asa ase asf asi ass ast asx at- ata ate atf ati ats att atx ax- axa axe axi axs axt axx eaa eae eaf eai eas eat eax eea eee eef ees eet eex ef- efa efe eff efi efs eft efx eia eie eif eii eis eit eix es- esa ese esf esi ess est esx eta ete etf eti ets ett etx ex- exa exe exi exs ext exx faa fae faf fai fas fat fax fea fee fef fei fes fet fex ffa ffe fff ffi ffs fft ffx fia fie fif fii fis fit fix fsa fse fsf fsi fss fst fsx fta fte ftf fti fts ftt ftx fxe fxi fxs fxt fxx i-f ia- iaa iae iaf iai ias iat ie- iea iee ief iei ies iet iex ifa ife iff ifi ifs ift ifx iia iie iif iii iis iit iix is- isa ise isf isi iss ist ita ite itf iti its itt itx ixe ixi saa sae saf sai sas sat sax se- sea see sef sei ses set sex sfa sfe sff sfi sfs sft sfx sia sie sif sii sis sit six ss- ssa sse ssf ssi sss sst ssx sta ste stf sti sts stt stx sxi sxs sxt t-x taa tae taf tai tas tat tax te- tea tee tef tei tes tet tex tfa tfe tff tfi tfs tft tfx tia tie tif tii tis tit tix tsa tse tsf tsi tss tst tsx tta tte ttf tti tts ttt ttx txe txf txi txs txt xaa xaf xas xat xee xes xet xex xfa xfe xfs xft xfx xia xie xii xis xit xix xsa xsi xss xst xtf xti xts xtx xxi xxx