-er a-a a-t aaa aae aaf aao aar aat aax aea aee aef aeo aer aet aex af- afa afe aff afo afr aft afx aoa aoe aof aoo aor aot aox ar- ara are arf aro arr art arx at- ata ate atf ato atr att atx ax- axa axe axo axr axt axx eaa eae eaf eao ear eat eax eea eee eef eeo eer eet eex ef- efa efe eff efo efr eft efx eo- eoa eoe eof eoo eor eot era ere erf ero err ert eta ete etf eto etr ett etx ex- exa exe exo exr ext exx faa fae faf fao far fat fax fea fee fef feo fer fet fex ffa ffe fff ffo ffr fft ffx foa foe fof foo for fot fox fra fre frf fro frr frt fta fte ftf fto ftr ftt ftx fxe fxr fxt fxx oaa oae oaf oao oar oat oax oea oee oef oeo oer oet oex of- ofa ofe off ofo ofr oft ofx oo- ooa oof ooo oor oot oox or- ora ore orf oro orr ort orx ot- ota ote otf oto otr ott ox- oxa oxf oxo oxt oxx ra- raa rae raf rao rar rat rax re- rea ree ref reo rer ret rex rfa rfe rff rfo rfr rft roa roe rof roo ror rot rox rra rrf rrr rrt rta rte rtf rto rtr rtt rtx rxr t-x taa tae taf tao tar tat tax te- tea tee tef teo ter tet tex tfa tfe tff tfo tfr tft tfx to- toa toe tof too tor tot tox tra tre trf tro trr trt trx tta tte ttf tto ttr ttt ttx txe txf txt xaa xaf xar xat xee xer xet xex xfa xfe xft xfx xoa xof xoo xor xot xox xrf xrt xrx xtf xtr xtx xxo xxx