-er eee eep eer ees eie eii eip eir eis ep- epe epi epp epr eps ere eri erp err ers es- ese esi esp esr ess ie- iee iei iep ier ies iie iii iip iir iis ipe ipi ipp ipr ips ir- ire iri irp irr irs is- ise isi isp isr iss p-p pee pei pep per pes pie pii pip pir pis ppe ppi ppp ppr pps pre pri prp prr prs ps- pse psi psp psr pss re- ree rei rep rer res rie rii rip rir ris rpe rpi rpp rpr rps rri rrp rrr rrs rse rsi rsp rsr rss se- see sei sep ser ses sie sii sip sir sis spe spi spp spr sps sr- sre sri srp srr srs ss- sse ssi ssp ssr sss