-er -up eee eeo eep eer ees eet eex eo- eoe eoo eop eor eos eot eou ep- epe epo epp epr eps ept epu epx ere ero erp err ers ert eru es- ese eso esp esr ess est esu esx ete eto etp etr ets ett etu etx eu- eue eup eur eus eut eux ex- exe exo exp exr exs ext exu exx oee oeo oep oer oes oet oex oo- ooo oop oor oos oot oox op- ope opo opp opr ops opt opx or- ore oro orp orr ors ort oru orx os- ose oso osp osr oss ost osu osx ot- ote oto otp otr ots ott otu ou- oue ouo oup our ous out ox- oxo oxt oxx p-p pee peo pep per pes pet peu pex poe poo pop por pos pot pou pox ppe ppo ppp ppr pps ppt ppu ppx pre pro prp prr prs prt pru prx ps- pse pso psp psr pss pst psu psx pt- pte pto ptp ptr pts ptt ptu ptx pue pup pur pus put puu pxe pxr pxs pxt re- ree reo rep rer res ret reu rex roe roo rop ror ros rot rou rox rpe rpo rpp rpr rps rpt rpu rpx rrp rrr rrs rrt rru rse rso rsp rsr rss rst rsu rsx rte rto rtp rtr rts rtt rtu rtx rue ruo rup rur rus rut ruu rux rxp rxr rxs se- see seo sep ser ses set seu sex soe soo sop sor sos sot sou sox spe spo spp spr sps spt spu spx sr- sre sro srp srr srs srt srx ss- sse sso ssp ssr sss sst ssu ssx ste sto stp str sts stt stu stx sue suo sup sur sus sut suu sux sxs sxt sxu t-x te- tee teo tep ter tes tet teu tex to- toe too top tor tos tot tou tox tpe tpo tpp tpr tps tpt tpu tpx tre tro trp trr trs trt tru trx tse tso tsp tsr tss tst tsu tsx tte tto ttp ttr tts ttt ttu ttx tue tuo tup tur tus tut tuu tux txe txs txt txu uee uep uer ues uet uoe uoo uop uor uos uot uox up- upe upo upp upr ups upt upu upx ur- ure uro urp urr urs urt uru urx use uso usp usr uss ust usu usx ute uto utp utr uts utt utu utx uue uur uus uut uuu uxo uxr uxt uxu xee xep xer xes xet xeu xex xoo xop xor xos xot xox xpe xpo xpp xps xpt xrt xrx xsp xss xst xtp xtr xts xtx xue xup xus xxo xxp xxx