-er -ol c-- ccc cce cck ccl cco ccr ccs ccu ce- cec cee cek cel ceo cer ces ceu ckc cko cks cl- clc cle clk cll clo clr cls clu co- coc coe cok col coo cor cos cou crc cre crk crl cro crr crs cru csc cse csk csl cso csr css csu cuc cue cuk cul cuo cur cus cuu ec- ecc ece eck ecl eco ecr ecs ecu eec eee eek eel eeo eer ees ekc eke ekl eko ekr eks eku elc ele elk ell elo elr els elu eo- eoc eoe eok eol eoo eor eos eou erc ere erk erl ero err ers eru es- esc ese esk esl eso esr ess esu eu- euc eue eul eur eus kcc kce kck kcl kcr kcs kcu ke- kec kee kek kel keo ker kes kkc kke kkk kkl kkr kks kku kl- klc klo klr kls klu koc koe kok kol koo kor kos kou krc krk krl kro krr krs kru ksc kse ksk ksl kso ksr kss ksu kuc kue kuk kul kur kus kuu lcc lce lck lcl lco lcr lcs lcu lec lee lek lel leo ler les leu lkl lkr lks llc lle llk lll llo llr lls llu loc loe lok lol loo lor los lou lrc lrk lro lrr lrs lru lsc lse lsk lsl lso lsr lss lsu luc lue luk lul luo lur lus luu oc- occ ock ocl oco ocr ocs ocu oec oee oel oeo oer oes okc oke okk okl oko okr oks oku olc ole olk oll olo ols olu oo- ooc ook ool ooo oor oos or- orc ore ork orl oro orr ors oru os- osc ose osk osl oso osr oss osu ou- ouc oue ouk oul ouo our ous rcc rce rcl rco rcr rcs rcu re- rec ree rek rel reo rer res reu rkc rke rkk rko rks rku rlc rle rll rlo rlr rls rlu roc roe rok rol roo ror ros rou rrc rrk rrl rrr rrs rru rsc rse rsk rsl rso rsr rss rsu ruc rue ruk ruo rur rus ruu scc sce sck scl sco scr scs scu se- sec see sek sel seo ser ses seu sk- skc ske skk skl sko skr sks sku slc sle slk sll slo slr sls slu soc soe sok sol soo sor sos sou sr- src sre srk srl sro srr srs ss- ssc sse ssk ssl sso ssr sss ssu suc sue suk sul suo sur sus suu ucc uce uck ucl uco ucr ucs ucu uec uee uel uer ues ukc uke ukk ukl ukr uku ulc ule ulk ull ulo ulr uls ulu uoc uoe uok uol uoo uor uos ur- urc ure urk url uro urr urs uru usc use usk usl uso usr uss usu uuc uue uur uus uuu