-er -up eee eep eer ees eet eie eii eip eir eis eit eiu ep- epe epi epp epr eps ept epu ere eri erp err ers ert eru es- ese esi esp esr ess est esu ete eti etp etr ets ett etu eu- eue eui eup eur eus eut ie- iee iei iep ier ies iet iie iii iip iir iis iit iiu ipe ipi ipp ipr ips ipt ipu ir- ire iri irp irr irs irt iru is- ise isi isp isr iss ist isu ite iti itp its itt itu iu- iue iui iup iur ius iut p-p pee pei pep per pes pet peu pie pii pip pir pis pit piu ppe ppi ppp ppr pps ppt ppu pre pri prp prr prs prt pru ps- pse psi psp psr pss pst psu pt- pte pti ptp ptr pts ptt ptu pue pui pup pur pus put puu re- ree rei rep rer res ret reu rie rii rip rir ris rit rpe rpi rpp rpr rps rpt rpu rri rrp rrr rrs rrt rru rse rsi rsp rsr rss rst rsu rte rti rtp rtr rts rtt rtu rue rui rup rur rus rut ruu se- see sei sep ser ses set seu sie sii sip sir sis sit siu spe spi spp spr sps spt spu sr- sre sri srp srr srs srt ss- sse ssi ssp ssr sss sst ssu ste sti stp str sts stt stu sue sui sup sur sus sut suu te- tee tei tep ter tes tet teu tie tii tip tir tis tit tiu tpe tpi tpp tpr tps tpt tpu tre tri trp trr trs trt tru tse tsi tsp tsr tss tst tsu tte tti ttp ttr tts ttt ttu tue tui tup tur tus tut tuu uee uei uep uer ues uet uie uii uip uir uis uit uiu up- upe upi upp upr ups upt upu ur- ure uri urp urr urs urt uru use usi usp usr uss ust usu ute uti utp utr uts utt utu uue uur uus uut uuu