-er c-- ccc cce ccl ccr ccs ce- cec cee cel cer ces cl- clc cle cll clr cls crc cre crl crr crs csc cse csl csr css ec- ecc ece ecl ecr ecs eec eee eel eer ees elc ele ell elr els erc ere erl err ers es- esc ese esl esr ess lcc lce lcl lcr lcs lec lee lel ler les llc lle lll llr lls lrc lrr lrs lsc lse lsl lsr lss rcc rce rcl rcr rcs re- rec ree rel rer res rlc rle rll rlr rls rrc rrl rrr rrs rsc rse rsl rsr rss scc sce scl scr scs se- sec see sel ser ses slc sle sll slr sls sr- src sre srl srr srs ss- ssc sse ssl ssr sss