-er eee eek eel eep eer ees eke ekl ekp ekr eks ele elk ell elp elr els ep- epe epl epp epr eps ere erk erl erp err ers es- ese esk esl esp esr ess ke- kee kek kel kep ker kes kke kkk kkl kkp kkr kks kl- klr kls kpe kpk kpl kpp kpr kps krk krl krp krr krs kse ksk ksl ksp ksr kss l-p lee lek lel lep ler les lkl lkp lkr lks lle llk lll llp llr lls lpe lpk lpl lpp lpr lps lrk lrp lrr lrs lse lsk lsl lsp lsr lss p-p pee pek pel pep per pes pke pkl pkp pkr pks ple plk pll plp plr pls ppe ppk ppl ppp ppr pps pre prk prl prp prr prs ps- pse psk psl psp psr pss re- ree rek rel rep rer res rke rkk rkp rks rle rll rlp rlr rls rpe rpk rpl rpp rpr rps rrk rrl rrp rrr rrs rse rsk rsl rsp rsr rss se- see sek sel sep ser ses sk- ske skk skl skp skr sks sle slk sll slp slr sls spe spk spl spp spr sps sr- sre srk srl srp srr srs ss- sse ssk ssl ssp ssr sss