-er -ol c-- ccc cce cck ccl cco ccp ccr ccs ce- cec cee cek cel ceo cep cer ces ckc cko cks cl- clc cle clk cll clo clp clr cls co- coc coe cok col coo cop cor cos cpc cpe cpk cpl cpo cpp cpr cps crc cre crk crl cro crp crr crs csc cse csk csl cso csp csr css ec- ecc ece eck ecl eco ecr ecs eec eee eek eel eeo eep eer ees ekc eke ekl eko ekp ekr eks elc ele elk ell elo elp elr els eo- eoc eoe eok eol eoo eop eor eos ep- epc epe epl epo epp epr eps erc ere erk erl ero erp err ers es- esc ese esk esl eso esp esr ess kcc kce kck kcl kcp kcr kcs ke- kec kee kek kel keo kep ker kes kkc kke kkk kkl kkp kkr kks kl- klc klo klr kls koc koe kok kol koo kop kor kos kpc kpe kpk kpl kpo kpp kpr kps krc krk krl kro krp krr krs ksc kse ksk ksl kso ksp ksr kss l-p lcc lce lck lcl lco lcp lcr lcs lec lee lek lel leo lep ler les lkl lkp lkr lks llc lle llk lll llo llp llr lls loc loe lok lol loo lop lor los lpc lpe lpk lpl lpo lpp lpr lps lrc lrk lro lrp lrr lrs lsc lse lsk lsl lso lsp lsr lss oc- occ ock ocl oco ocp ocr ocs oec oee oel oeo oep oer oes okc oke okk okl oko okp okr oks olc ole olk oll olo olp ols oo- ooc ook ool ooo oop oor oos op- opc ope opk opl opo opp opr ops or- orc ore ork orl oro orp orr ors os- osc ose osk osl oso osp osr oss p-p pcc pce pck pcl pco pcp pcr pcs pec pee pek pel peo pep per pes pkc pke pkl pko pkp pkr pks plc ple plk pll plo plp plr pls poc poe pok pol poo pop por pos ppc ppe ppk ppl ppo ppp ppr pps prc pre prk prl pro prp prr prs ps- psc pse psk psl pso psp psr pss rcc rce rcl rco rcp rcr rcs re- rec ree rek rel reo rep rer res rkc rke rkk rko rkp rks rlc rle rll rlo rlp rlr rls roc roe rok rol roo rop ror ros rpc rpe rpk rpl rpo rpp rpr rps rrc rrk rrl rrp rrr rrs rsc rse rsk rsl rso rsp rsr rss scc sce sck scl sco scp scr scs se- sec see sek sel seo sep ser ses sk- skc ske skk skl sko skp skr sks slc sle slk sll slo slp slr sls soc soe sok sol soo sop sor sos spc spe spk spl spo spp spr sps sr- src sre srk srl sro srp srr srs ss- ssc sse ssk ssl sso ssp ssr sss