-er eee eef een eep eer ees ef- efe eff efi efp efr efs eie eif eii ein eip eir eis en- ene enf eni enn enp enr ens ep- epe epf epi epn epp epr eps ere erf eri ern erp err ers es- ese esf esi esn esp esr ess fee fef fei fen fep fer fes ffe fff ffi ffn ffp ffr ffs fie fif fii fin fip fir fis fne fnf fni fnn fnp fnr fns fpe fpi fpn fpp fpr fps fre frf fri frn frp frr frs fse fsf fsi fsn fsp fsr fss i-f ie- iee ief iei ien iep ier ies ife iff ifi ifn ifp ifr ifs iie iif iii iin iip iir iis in- ine inf ini inn inp inr ins ipe ipf ipi ipn ipp ipr ips ir- ire irf iri irn irp irr irs is- ise isf isi isn isp isr iss n-i ne- nee nef nei nen nep ner nes nfe nff nfi nfn nfp nfr nfs nie nif nii nin nip nir nis nne nnf nni nnn nnp nns npe npf npi npn npp npr nps nre nrf nri nrn nrp nrr nrs nse nsf nsi nsn nsp nsr nss p-p pee pef pei pen pep per pes pfe pff pfi pfn pfp pfr pfs pie pif pii pin pip pir pis pn- pne pnf pni pnn pnp pnr pns ppe ppf ppi ppn ppp ppr pps pre prf pri prn prp prr prs ps- pse psf psi psn psp psr pss re- ree ref rei ren rep rer res rfe rff rfi rfn rfp rfr rfs rie rif rii rin rip rir ris rni rnn rnp rnr rns rpe rpf rpi rpn rpp rpr rps rrf rri rrn rrp rrr rrs rse rsf rsi rsn rsp rsr rss se- see sef sei sen sep ser ses sfe sff sfi sfn sfp sfr sfs sie sif sii sin sip sir sis sne snf sni snn snp snr sns spe spf spi spn spp spr sps sr- sre srf sri srn srp srr srs ss- sse ssf ssi ssn ssp ssr sss