-er -ol c-- ccc cce ccl cco ccr ccs ce- cec cee cel ceo cer ces cl- clc cle cll clo clr cls co- coc coe col coo cor cos crc cre crl cro crr crs csc cse csl cso csr css ec- ecc ece ecl eco ecr ecs eec eee eel eeo eer ees elc ele ell elo elr els eo- eoc eoe eol eoo eor eos erc ere erl ero err ers es- esc ese esl eso esr ess lcc lce lcl lco lcr lcs lec lee lel leo ler les llc lle lll llo llr lls loc loe lol loo lor los lrc lro lrr lrs lsc lse lsl lso lsr lss oc- occ ocl oco ocr ocs oec oee oel oeo oer oes olc ole oll olo ols oo- ooc ool ooo oor oos or- orc ore orl oro orr ors os- osc ose osl oso osr oss rcc rce rcl rco rcr rcs re- rec ree rel reo rer res rlc rle rll rlo rlr rls roc roe rol roo ror ros rrc rrl rrr rrs rsc rse rsl rso rsr rss scc sce scl sco scr scs se- sec see sel seo ser ses slc sle sll slo slr sls soc soe sol soo sor sos sr- src sre srl sro srr srs ss- ssc sse ssl sso ssr sss