-er a-a a-t aaa aae aao aar aat aax aea aee aeo aer aet aex aoa aoe aoo aor aot aox ar- ara are aro arr art arx at- ata ate ato atr att atx ax- axa axe axo axr axt axx eaa eae eao ear eat eax eea eee eeo eer eet eex eo- eoa eoe eoo eor eot era ere ero err ert eta ete eto etr ett etx ex- exa exe exo exr ext exx oaa oae oao oar oat oax oea oee oeo oer oet oex oo- ooa ooo oor oot oox or- ora ore oro orr ort orx ot- ota ote oto otr ott ox- oxa oxo oxt oxx ra- raa rae rao rar rat rax re- rea ree reo rer ret rex roa roe roo ror rot rox rra rrr rrt rta rte rto rtr rtt rtx rxr t-x taa tae tao tar tat tax te- tea tee teo ter tet tex to- toa toe too tor tot tox tra tre tro trr trt trx tta tte tto ttr ttt ttx txe txt xaa xar xat xee xer xet xex xoa xoo xor xot xox xrt xrx xtr xtx xxo xxx