-er eee eeo eep eer ees eet eo- eoe eoo eop eor eos eot ep- epe epo epp epr eps ept ere ero erp err ers ert es- ese eso esp esr ess est ete eto etp etr ets ett oee oeo oep oer oes oet oo- ooo oop oor oos oot op- ope opo opp opr ops opt or- ore oro orp orr ors ort os- ose oso osp osr oss ost ot- ote oto otp otr ots ott p-p pee peo pep per pes pet poe poo pop por pos pot ppe ppo ppp ppr pps ppt pre pro prp prr prs prt ps- pse pso psp psr pss pst pt- pte pto ptp ptr pts ptt re- ree reo rep rer res ret roe roo rop ror ros rot rpe rpo rpp rpr rps rpt rrp rrr rrs rrt rse rso rsp rsr rss rst rte rto rtp rtr rts rtt se- see seo sep ser ses set soe soo sop sor sos sot spe spo spp spr sps spt sr- sre sro srp srr srs srt ss- sse sso ssp ssr sss sst ste sto stp str sts stt te- tee teo tep ter tes tet to- toe too top tor tos tot tpe tpo tpp tpr tps tpt tre tro trp trr trs trt tse tso tsp tsr tss tst tte tto ttp ttr tts ttt