-er eee eek eel eep eer ees eie eii eik eil eip eir eis eke eki ekl ekp ekr eks ele eli elk ell elp elr els ep- epe epi epl epp epr eps ere eri erk erl erp err ers es- ese esi esk esl esp esr ess ie- iee iei iek iel iep ier ies iie iii iil iip iir iis ike iki ikk ikl ikr iks il- ile ili ilk ill ilp ilr ils ipe ipi ipl ipp ipr ips ir- ire iri irk irl irp irr irs is- ise isi isk isl isp isr iss ke- kee kei kek kel kep ker kes kie kii kik kil kip kir kis kke kki kkk kkl kkp kkr kks kl- kli klr kls kpe kpi kpk kpl kpp kpr kps kri krk krl krp krr krs kse ksi ksk ksl ksp ksr kss l-p lee lei lek lel lep ler les lie lii lik lil lip lir lis lkl lkp lkr lks lle lli llk lll llp llr lls lpe lpi lpk lpl lpp lpr lps lri lrk lrp lrr lrs lse lsi lsk lsl lsp lsr lss p-p pee pei pek pel pep per pes pie pii pik pil pip pir pis pke pki pkl pkp pkr pks ple pli plk pll plp plr pls ppe ppi ppk ppl ppp ppr pps pre pri prk prl prp prr prs ps- pse psi psk psl psp psr pss re- ree rei rek rel rep rer res rie rii rik ril rip rir ris rke rkk rkp rks rle rli rll rlp rlr rls rpe rpi rpk rpl rpp rpr rps rri rrk rrl rrp rrr rrs rse rsi rsk rsl rsp rsr rss se- see sei sek sel sep ser ses sie sii sik sil sip sir sis sk- ske ski skk skl skp skr sks sle sli slk sll slp slr sls spe spi spk spl spp spr sps sr- sre sri srk srl srp srr srs ss- sse ssi ssk ssl ssp ssr sss