a-a a-t aaa aae aaf aao aat aax aea aee aef aeo aet aex af- afa afe aff afo aft afx aoa aoe aof aoo aot aox at- ata ate atf ato att atx ax- axa axe axo axt axx eaa eae eaf eao eat eax eea eee eef eeo eet eex ef- efa efe eff efo eft efx eo- eoa eoe eof eoo eot eta ete etf eto ett etx ex- exa exe exo ext exx faa fae faf fao fat fax fea fee fef feo fet fex ffa ffe fff ffo fft ffx foa foe fof foo fot fox fta fte ftf fto ftt ftx fxe fxt fxx oaa oae oaf oao oat oax oea oee oef oeo oet oex of- ofa ofe off ofo oft ofx oo- ooa oof ooo oot oox ot- ota ote otf oto ott ox- oxa oxf oxo oxt oxx t-x taa tae taf tao tat tax te- tea tee tef teo tet tex tfa tfe tff tfo tft tfx to- toa toe tof too tot tox tta tte ttf tto ttt ttx txe txf txt xaa xaf xat xee xet xex xfa xfe xft xfx xoa xof xoo xot xox xtf xtx xxo xxx