-er eee eef eep eer ees eet ef- efe eff efi efp efr efs eft eie eif eii eip eir eis eit ep- epe epf epi epp epr eps ept ere erf eri erp err ers ert es- ese esf esi esp esr ess est ete etf eti etp etr ets ett fee fef fei fep fer fes fet ffe fff ffi ffp ffr ffs fft fie fif fii fip fir fis fit fpe fpi fpp fpr fps fpt fre frf fri frp frr frs frt fse fsf fsi fsp fsr fss fst fte ftf fti ftp ftr fts ftt i-f ie- iee ief iei iep ier ies iet ife iff ifi ifp ifr ifs ift iie iif iii iip iir iis iit ipe ipf ipi ipp ipr ips ipt ir- ire irf iri irp irr irs irt is- ise isf isi isp isr iss ist ite itf iti itp its itt p-p pee pef pei pep per pes pet pfe pff pfi pfp pfr pfs pft pie pif pii pip pir pis pit ppe ppf ppi ppp ppr pps ppt pre prf pri prp prr prs prt ps- pse psf psi psp psr pss pst pt- pte ptf pti ptp ptr pts ptt re- ree ref rei rep rer res ret rfe rff rfi rfp rfr rfs rft rie rif rii rip rir ris rit rpe rpf rpi rpp rpr rps rpt rrf rri rrp rrr rrs rrt rse rsf rsi rsp rsr rss rst rte rtf rti rtp rtr rts rtt se- see sef sei sep ser ses set sfe sff sfi sfp sfr sfs sft sie sif sii sip sir sis sit spe spf spi spp spr sps spt sr- sre srf sri srp srr srs srt ss- sse ssf ssi ssp ssr sss sst ste stf sti stp str sts stt te- tee tef tei tep ter tes tet tfe tff tfi tfp tfr tfs tft tie tif tii tip tir tis tit tpe tpf tpi tpp tpr tps tpt tre trf tri trp trr trs trt tse tsf tsi tsp tsr tss tst tte ttf tti ttp ttr tts ttt