-er eee eek een eep eer ees eie eii eik ein eip eir eis eke eki ekp ekr eks en- ene eni enk enn enp enr ens ep- epe epi epn epp epr eps ere eri erk ern erp err ers es- ese esi esk esn esp esr ess ie- iee iei iek ien iep ier ies iie iii iin iip iir iis ike iki ikk ikr iks in- ine ini ink inn inp inr ins ipe ipi ipn ipp ipr ips ir- ire iri irk irn irp irr irs is- ise isi isk isn isp isr iss ke- kee kei kek ken kep ker kes kie kii kik kin kip kir kis kke kki kkk kkn kkp kkr kks kn- kne kni knk knn knp knr kpe kpi kpk kpn kpp kpr kps kri krk krn krp krr krs kse ksi ksk ksn ksp ksr kss n-i ne- nee nei nek nen nep ner nes nie nii nik nin nip nir nis nke nki nkk nkn nkp nkr nks nne nni nnk nnn nnp nns npe npi npn npp npr nps nre nri nrk nrn nrp nrr nrs nse nsi nsk nsn nsp nsr nss p-p pee pei pek pen pep per pes pie pii pik pin pip pir pis pke pki pkn pkp pkr pks pn- pne pni pnk pnn pnp pnr pns ppe ppi ppk ppn ppp ppr pps pre pri prk prn prp prr prs ps- pse psi psk psn psp psr pss re- ree rei rek ren rep rer res rie rii rik rin rip rir ris rke rkk rkp rks rni rnn rnp rnr rns rpe rpi rpk rpn rpp rpr rps rri rrk rrn rrp rrr rrs rse rsi rsk rsn rsp rsr rss se- see sei sek sen sep ser ses sie sii sik sin sip sir sis sk- ske ski skk skp skr sks sne sni snk snn snp snr sns spe spi spk spn spp spr sps sr- sre sri srk srn srp srr srs ss- sse ssi ssk ssn ssp ssr sss