-er -up eee eep eer ees ep- epe epp epr eps epu ere erp err ers eru es- ese esp esr ess esu eu- eue eup eur eus p-p pee pep per pes peu ppe ppp ppr pps ppu pre prp prr prs pru ps- pse psp psr pss psu pue pup pur pus puu re- ree rep rer res reu rpe rpp rpr rps rpu rrp rrr rrs rru rse rsp rsr rss rsu rue rup rur rus ruu se- see sep ser ses seu spe spp spr sps spu sr- sre srp srr srs ss- sse ssp ssr sss ssu sue sup sur sus suu uee uep uer ues up- upe upp upr ups upu ur- ure urp urr urs uru use usp usr uss usu uue uur uus uuu