-er eee eel eep eer ees eie eii eil eip eir eis ele eli ell elp elr els ep- epe epi epl epp epr eps ere eri erl erp err ers es- ese esi esl esp esr ess ie- iee iei iel iep ier ies iie iii iil iip iir iis il- ile ili ill ilp ilr ils ipe ipi ipl ipp ipr ips ir- ire iri irl irp irr irs is- ise isi isl isp isr iss l-p lee lei lel lep ler les lie lii lil lip lir lis lle lli lll llp llr lls lpe lpi lpl lpp lpr lps lri lrp lrr lrs lse lsi lsl lsp lsr lss p-p pee pei pel pep per pes pie pii pil pip pir pis ple pli pll plp plr pls ppe ppi ppl ppp ppr pps pre pri prl prp prr prs ps- pse psi psl psp psr pss re- ree rei rel rep rer res rie rii ril rip rir ris rle rli rll rlp rlr rls rpe rpi rpl rpp rpr rps rri rrl rrp rrr rrs rse rsi rsl rsp rsr rss se- see sei sel sep ser ses sie sii sil sip sir sis sle sli sll slp slr sls spe spi spl spp spr sps sr- sre sri srl srp srr srs ss- sse ssi ssl ssp ssr sss