-er eee eep eer ees eet ep- epe epp epr eps ept ere erp err ers ert es- ese esp esr ess est ete etp etr ets ett p-p pee pep per pes pet ppe ppp ppr pps ppt pre prp prr prs prt ps- pse psp psr pss pst pt- pte ptp ptr pts ptt re- ree rep rer res ret rpe rpp rpr rps rpt rrp rrr rrs rrt rse rsp rsr rss rst rte rtp rtr rts rtt se- see sep ser ses set spe spp spr sps spt sr- sre srp srr srs srt ss- sse ssp ssr sss sst ste stp str sts stt te- tee tep ter tes tet tpe tpp tpr tps tpt tre trp trr trs trt tse tsp tsr tss tst tte ttp ttr tts ttt