-er -up eee een eep eer ees eie eii ein eip eir eis eiu en- ene eni enn enp enr ens enu ep- epe epi epn epp epr eps epu ere eri ern erp err ers eru es- ese esi esn esp esr ess esu eu- eue eui eun eup eur eus ie- iee iei ien iep ier ies iie iii iin iip iir iis iiu in- ine ini inn inp inr ins inu ipe ipi ipn ipp ipr ips ipu ir- ire iri irn irp irr irs iru is- ise isi isn isp isr iss isu iu- iue iui iup iur ius n-i ne- nee nei nen nep ner nes neu nie nii nin nip nir nis niu nne nni nnn nnp nns nnu npe npi npn npp npr nps npu nre nri nrn nrp nrr nrs nru nse nsi nsn nsp nsr nss nsu nue nui nun nup nur nus nuu p-p pee pei pen pep per pes peu pie pii pin pip pir pis piu pn- pne pni pnn pnp pnr pns pnu ppe ppi ppn ppp ppr pps ppu pre pri prn prp prr prs pru ps- pse psi psn psp psr pss psu pue pui pun pup pur pus puu re- ree rei ren rep rer res reu rie rii rin rip rir ris rni rnn rnp rnr rns rnu rpe rpi rpn rpp rpr rps rpu rri rrn rrp rrr rrs rru rse rsi rsn rsp rsr rss rsu rue rui run rup rur rus ruu se- see sei sen sep ser ses seu sie sii sin sip sir sis siu sne sni snn snp snr sns snu spe spi spn spp spr sps spu sr- sre sri srn srp srr srs ss- sse ssi ssn ssp ssr sss ssu sue sui sun sup sur sus suu uee uei uen uep uer ues uie uii uin uip uir uis uiu un- une uni unn unp unr uns unu up- upe upi upn upp upr ups upu ur- ure uri urn urp urr urs uru use usi usn usp usr uss usu uue uun uur uus uuu