-er -up eee eef eep eer ees eet ef- efe eff efp efr efs eft ep- epe epf epp epr eps ept epu ere erf erp err ers ert eru es- ese esf esp esr ess est esu ete etf etp etr ets ett etu eu- eue euf eup eur eus eut fee fef fep fer fes fet feu ffe fff ffp ffr ffs fft ffu fpe fpp fpr fps fpt fpu fre frf frp frr frs frt fru fse fsf fsp fsr fss fst fsu fte ftf ftp ftr fts ftt ftu fue fuf fup fur fus fut fuu p-p pee pef pep per pes pet peu pfe pff pfp pfr pfs pft pfu ppe ppf ppp ppr pps ppt ppu pre prf prp prr prs prt pru ps- pse psf psp psr pss pst psu pt- pte ptf ptp ptr pts ptt ptu pue puf pup pur pus put puu re- ree ref rep rer res ret reu rfe rff rfp rfr rfs rft rfu rpe rpf rpp rpr rps rpt rpu rrf rrp rrr rrs rrt rru rse rsf rsp rsr rss rst rsu rte rtf rtp rtr rts rtt rtu rue ruf rup rur rus rut ruu se- see sef sep ser ses set seu sfe sff sfp sfr sfs sft sfu spe spf spp spr sps spt spu sr- sre srf srp srr srs srt ss- sse ssf ssp ssr sss sst ssu ste stf stp str sts stt stu sue suf sup sur sus sut suu te- tee tef tep ter tes tet teu tfe tff tfp tfr tfs tft tfu tpe tpf tpp tpr tps tpt tpu tre trf trp trr trs trt tru tse tsf tsp tsr tss tst tsu tte ttf ttp ttr tts ttt ttu tue tuf tup tur tus tut tuu uee uef uep uer ues uet ufe uff ufp ufr ufs uft ufu up- upe upf upp upr ups upt upu ur- ure urf urp urr urs urt uru use usf usp usr uss ust usu ute utf utp utr uts utt utu uue uur uus uut uuu