-er c-- ccc cce cck ccl ccp ccr ccs ce- cec cee cek cel cep cer ces ckc cks cl- clc cle clk cll clp clr cls cpc cpe cpk cpl cpp cpr cps crc cre crk crl crp crr crs csc cse csk csl csp csr css ec- ecc ece eck ecl ecr ecs eec eee eek eel eep eer ees ekc eke ekl ekp ekr eks elc ele elk ell elp elr els ep- epc epe epl epp epr eps erc ere erk erl erp err ers es- esc ese esk esl esp esr ess kcc kce kck kcl kcp kcr kcs ke- kec kee kek kel kep ker kes kkc kke kkk kkl kkp kkr kks kl- klc klr kls kpc kpe kpk kpl kpp kpr kps krc krk krl krp krr krs ksc kse ksk ksl ksp ksr kss l-p lcc lce lck lcl lcp lcr lcs lec lee lek lel lep ler les lkl lkp lkr lks llc lle llk lll llp llr lls lpc lpe lpk lpl lpp lpr lps lrc lrk lrp lrr lrs lsc lse lsk lsl lsp lsr lss p-p pcc pce pck pcl pcp pcr pcs pec pee pek pel pep per pes pkc pke pkl pkp pkr pks plc ple plk pll plp plr pls ppc ppe ppk ppl ppp ppr pps prc pre prk prl prp prr prs ps- psc pse psk psl psp psr pss rcc rce rcl rcp rcr rcs re- rec ree rek rel rep rer res rkc rke rkk rkp rks rlc rle rll rlp rlr rls rpc rpe rpk rpl rpp rpr rps rrc rrk rrl rrp rrr rrs rsc rse rsk rsl rsp rsr rss scc sce sck scl scp scr scs se- sec see sek sel sep ser ses sk- skc ske skk skl skp skr sks slc sle slk sll slp slr sls spc spe spk spl spp spr sps sr- src sre srk srl srp srr srs ss- ssc sse ssk ssl ssp ssr sss