-er -up eee eek eep eer ees eie eii eik eip eir eis eiu eke eki ekp ekr eks eku ep- epe epi epp epr eps epu ere eri erk erp err ers eru es- ese esi esk esp esr ess esu eu- eue eui eup eur eus ie- iee iei iek iep ier ies iie iii iip iir iis iiu ike iki ikk ikr iks iku ipe ipi ipp ipr ips ipu ir- ire iri irk irp irr irs iru is- ise isi isk isp isr iss isu iu- iue iui iup iur ius ke- kee kei kek kep ker kes kie kii kik kip kir kis kiu kke kki kkk kkp kkr kks kku kpe kpi kpk kpp kpr kps kpu kri krk krp krr krs kru kse ksi ksk ksp ksr kss ksu kue kui kuk kup kur kus kuu p-p pee pei pek pep per pes peu pie pii pik pip pir pis piu pke pki pkp pkr pks pku ppe ppi ppk ppp ppr pps ppu pre pri prk prp prr prs pru ps- pse psi psk psp psr pss psu pue pui puk pup pur pus puu re- ree rei rek rep rer res reu rie rii rik rip rir ris rke rkk rkp rks rku rpe rpi rpk rpp rpr rps rpu rri rrk rrp rrr rrs rru rse rsi rsk rsp rsr rss rsu rue rui ruk rup rur rus ruu se- see sei sek sep ser ses seu sie sii sik sip sir sis siu sk- ske ski skk skp skr sks sku spe spi spk spp spr sps spu sr- sre sri srk srp srr srs ss- sse ssi ssk ssp ssr sss ssu sue sui suk sup sur sus suu uee uei uep uer ues uie uii uip uir uis uiu uke uki ukk ukp ukr uku up- upe upi upk upp upr ups upu ur- ure uri urk urp urr urs uru use usi usk usp usr uss usu uue uur uus uuu