-er c-- ccc cce ccl ccn ccr ccs ce- cec cee cel cen cer ces cl- clc cle cll cln clr cls cn- cnc cne cnl cnn cnr cns crc cre crl crn crr crs csc cse csl csn csr css ec- ecc ece ecl ecn ecr ecs eec eee eel een eer ees elc ele ell eln elr els en- enc ene enl enn enr ens erc ere erl ern err ers es- esc ese esl esn esr ess lcc lce lcl lcn lcr lcs lec lee lel len ler les llc lle lll lln llr lls lnc lne lnl lnn lnr lns lrc lrn lrr lrs lsc lse lsl lsn lsr lss ncc nce ncl ncn ncr ncs ne- nec nee nel nen ner nes nlc nle nll nln nlr nls nnc nne nnl nnn nns nrc nre nrl nrn nrr nrs nsc nse nsl nsn nsr nss rcc rce rcl rcn rcr rcs re- rec ree rel ren rer res rlc rle rll rln rlr rls rnc rnn rnr rns rrc rrl rrn rrr rrs rsc rse rsl rsn rsr rss scc sce scl scn scr scs se- sec see sel sen ser ses slc sle sll sln slr sls snc sne snl snn snr sns sr- src sre srl srn srr srs ss- ssc sse ssl ssn ssr sss