-er eee eef een eeo eer ees ef- efe eff efo efr efs en- ene enf enn eno enr ens eo- eoe eof eon eoo eor eos ere erf ern ero err ers es- ese esf esn eso esr ess fee fef fen feo fer fes ffe fff ffn ffo ffr ffs fne fnf fnn fnr fns foe fof fon foo for fos fre frf frn fro frr frs fse fsf fsn fso fsr fss ne- nee nef nen neo ner nes nfe nff nfn nfo nfr nfs nne nnf nnn nno nns no- noe nof non noo nor nos nre nrf nrn nro nrr nrs nse nsf nsn nso nsr nss oee oef oen oeo oer oes of- ofe off ofn ofo ofr ofs on- one onf onn ono onr ons oo- oof oon ooo oor oos or- ore orf orn oro orr ors os- ose osf osn oso osr oss re- ree ref ren reo rer res rfe rff rfn rfo rfr rfs rnn rno rnr rns roe rof ron roo ror ros rrf rrn rrr rrs rse rsf rsn rso rsr rss se- see sef sen seo ser ses sfe sff sfn sfo sfr sfs sne snf snn sno snr sns soe sof son soo sor sos sr- sre srf srn sro srr srs ss- sse ssf ssn sso ssr sss