-er eee eef een eer ees eet ef- efe eff efr efs eft en- ene enf enn enr ens ent ere erf ern err ers ert es- ese esf esn esr ess est ete etf etn etr ets ett fee fef fen fer fes fet ffe fff ffn ffr ffs fft fne fnf fnn fnr fns fnt fre frf frn frr frs frt fse fsf fsn fsr fss fst fte ftf ftn ftr fts ftt ne- nee nef nen ner nes net nfe nff nfn nfr nfs nft nne nnf nnn nns nnt nre nrf nrn nrr nrs nrt nse nsf nsn nsr nss nst nte ntf ntn ntr nts ntt re- ree ref ren rer res ret rfe rff rfn rfr rfs rft rnn rnr rns rnt rrf rrn rrr rrs rrt rse rsf rsn rsr rss rst rte rtf rtn rtr rts rtt se- see sef sen ser ses set sfe sff sfn sfr sfs sft sne snf snn snr sns snt sr- sre srf srn srr srs srt ss- sse ssf ssn ssr sss sst ste stf stn str sts stt te- tee tef ten ter tes tet tfe tff tfn tfr tfs tft tne tnf tnn tnr tns tnt tre trf trn trr trs trt tse tsf tsn tsr tss tst tte ttf ttn ttr tts ttt