a-a a-t aaa aae aaf aao aas aat aax aea aee aef aeo aes aet aex af- afa afe aff afo afs aft afx aoa aoe aof aoo aos aot aox as- asa ase asf aso ass ast asx at- ata ate atf ato ats att atx ax- axa axe axo axs axt axx eaa eae eaf eao eas eat eax eea eee eef eeo ees eet eex ef- efa efe eff efo efs eft efx eo- eoa eoe eof eoo eos eot es- esa ese esf eso ess est esx eta ete etf eto ets ett etx ex- exa exe exo exs ext exx faa fae faf fao fas fat fax fea fee fef feo fes fet fex ffa ffe fff ffo ffs fft ffx foa foe fof foo fos fot fox fsa fse fsf fso fss fst fsx fta fte ftf fto fts ftt ftx fxe fxs fxt fxx oaa oae oaf oao oas oat oax oea oee oef oeo oes oet oex of- ofa ofe off ofo ofs oft ofx oo- ooa oof ooo oos oot oox os- osa ose osf oso oss ost osx ot- ota ote otf oto ots ott ox- oxa oxf oxo oxt oxx saa sae saf sao sas sat sax se- sea see sef seo ses set sex sfa sfe sff sfo sfs sft sfx soa soe sof soo sos sot sox ss- ssa sse ssf sso sss sst ssx sta ste stf sto sts stt stx sxs sxt t-x taa tae taf tao tas tat tax te- tea tee tef teo tes tet tex tfa tfe tff tfo tfs tft tfx to- toa toe tof too tos tot tox tsa tse tsf tso tss tst tsx tta tte ttf tto tts ttt ttx txe txf txs txt xaa xaf xas xat xee xes xet xex xfa xfe xfs xft xfx xoa xof xoo xos xot xox xsa xss xst xtf xts xtx xxo xxx