-er -up eee eek eep eer ees eke ekp ekr eks eku ep- epe epp epr eps epu ere erk erp err ers eru es- ese esk esp esr ess esu eu- eue eup eur eus ke- kee kek kep ker kes kke kkk kkp kkr kks kku kpe kpk kpp kpr kps kpu krk krp krr krs kru kse ksk ksp ksr kss ksu kue kuk kup kur kus kuu p-p pee pek pep per pes peu pke pkp pkr pks pku ppe ppk ppp ppr pps ppu pre prk prp prr prs pru ps- pse psk psp psr pss psu pue puk pup pur pus puu re- ree rek rep rer res reu rke rkk rkp rks rku rpe rpk rpp rpr rps rpu rrk rrp rrr rrs rru rse rsk rsp rsr rss rsu rue ruk rup rur rus ruu se- see sek sep ser ses seu sk- ske skk skp skr sks sku spe spk spp spr sps spu sr- sre srk srp srr srs ss- sse ssk ssp ssr sss ssu sue suk sup sur sus suu uee uep uer ues uke ukk ukp ukr uku up- upe upk upp upr ups upu ur- ure urk urp urr urs uru use usk usp usr uss usu uue uur uus uuu