-er eee eef eer ees eet ef- efe eff efi efr efs eft eie eif eii eir eis eit ere erf eri err ers ert es- ese esf esi esr ess est ete etf eti etr ets ett fee fef fei fer fes fet ffe fff ffi ffr ffs fft fie fif fii fir fis fit fre frf fri frr frs frt fse fsf fsi fsr fss fst fte ftf fti ftr fts ftt i-f ie- iee ief iei ier ies iet ife iff ifi ifr ifs ift iie iif iii iir iis iit ir- ire irf iri irr irs irt is- ise isf isi isr iss ist ite itf iti its itt re- ree ref rei rer res ret rfe rff rfi rfr rfs rft rie rif rii rir ris rit rrf rri rrr rrs rrt rse rsf rsi rsr rss rst rte rtf rti rtr rts rtt se- see sef sei ser ses set sfe sff sfi sfr sfs sft sie sif sii sir sis sit sr- sre srf sri srr srs srt ss- sse ssf ssi ssr sss sst ste stf sti str sts stt te- tee tef tei ter tes tet tfe tff tfi tfr tfs tft tie tif tii tir tis tit tre trf tri trr trs trt tse tsf tsi tsr tss tst tte ttf tti ttr tts ttt