-er eee eeo eer eet eex eo- eoe eoo eor eot eou ere ero err ert eru ete eto etr ett etu etx eu- eue eur eut eux ex- exe exo exr ext exu exx oee oeo oer oet oex oo- ooo oor oot oox or- ore oro orr ort oru orx ot- ote oto otr ott otu ou- oue ouo our out ox- oxo oxt oxx re- ree reo rer ret reu rex roe roo ror rot rou rox rrr rrt rru rte rto rtr rtt rtu rtx rue ruo rur rut ruu rux rxr t-x te- tee teo ter tet teu tex to- toe too tor tot tou tox tre tro trr trt tru trx tte tto ttr ttt ttu ttx tue tuo tur tut tuu tux txe txt txu uee uer uet uoe uoo uor uot uox ur- ure uro urr urt uru urx ute uto utr utt utu utx uue uur uut uuu uxo uxr uxt uxu xee xer xet xeu xex xoo xor xot xox xrt xrx xtr xtx xue xxo xxx