-er eee een eep eer ees eie eii ein eip eir eis en- ene eni enn enp enr ens ep- epe epi epn epp epr eps ere eri ern erp err ers es- ese esi esn esp esr ess ie- iee iei ien iep ier ies iie iii iin iip iir iis in- ine ini inn inp inr ins ipe ipi ipn ipp ipr ips ir- ire iri irn irp irr irs is- ise isi isn isp isr iss n-i ne- nee nei nen nep ner nes nie nii nin nip nir nis nne nni nnn nnp nns npe npi npn npp npr nps nre nri nrn nrp nrr nrs nse nsi nsn nsp nsr nss p-p pee pei pen pep per pes pie pii pin pip pir pis pn- pne pni pnn pnp pnr pns ppe ppi ppn ppp ppr pps pre pri prn prp prr prs ps- pse psi psn psp psr pss re- ree rei ren rep rer res rie rii rin rip rir ris rni rnn rnp rnr rns rpe rpi rpn rpp rpr rps rri rrn rrp rrr rrs rse rsi rsn rsp rsr rss se- see sei sen sep ser ses sie sii sin sip sir sis sne sni snn snp snr sns spe spi spn spp spr sps sr- sre sri srn srp srr srs ss- sse ssi ssn ssp ssr sss