-er eee eep eer ees eet eie eii eip eir eis eit ep- epe epi epp epr eps ept ere eri erp err ers ert es- ese esi esp esr ess est ete eti etp etr ets ett ie- iee iei iep ier ies iet iie iii iip iir iis iit ipe ipi ipp ipr ips ipt ir- ire iri irp irr irs irt is- ise isi isp isr iss ist ite iti itp its itt p-p pee pei pep per pes pet pie pii pip pir pis pit ppe ppi ppp ppr pps ppt pre pri prp prr prs prt ps- pse psi psp psr pss pst pt- pte pti ptp ptr pts ptt re- ree rei rep rer res ret rie rii rip rir ris rit rpe rpi rpp rpr rps rpt rri rrp rrr rrs rrt rse rsi rsp rsr rss rst rte rti rtp rtr rts rtt se- see sei sep ser ses set sie sii sip sir sis sit spe spi spp spr sps spt sr- sre sri srp srr srs srt ss- sse ssi ssp ssr sss sst ste sti stp str sts stt te- tee tei tep ter tes tet tie tii tip tir tis tit tpe tpi tpp tpr tps tpt tre tri trp trr trs trt tse tsi tsp tsr tss tst tte tti ttp ttr tts ttt