-er c-- ccc cce cck ccl ccn ccr ccs ce- cec cee cek cel cen cer ces ckc cks cl- clc cle clk cll cln clr cls cn- cnc cne cnl cnn cnr cns crc cre crk crl crn crr crs csc cse csk csl csn csr css ec- ecc ece eck ecl ecn ecr ecs eec eee eek eel een eer ees ekc eke ekl ekr eks elc ele elk ell eln elr els en- enc ene enk enl enn enr ens erc ere erk erl ern err ers es- esc ese esk esl esn esr ess kcc kce kck kcl kcn kcr kcs ke- kec kee kek kel ken ker kes kkc kke kkk kkl kkn kkr kks kl- klc klr kls kn- knc kne knk knl knn knr krc krk krl krn krr krs ksc kse ksk ksl ksn ksr kss lcc lce lck lcl lcn lcr lcs lec lee lek lel len ler les lkl lkr lks llc lle llk lll lln llr lls lnc lne lnk lnl lnn lnr lns lrc lrk lrn lrr lrs lsc lse lsk lsl lsn lsr lss ncc nce nck ncl ncn ncr ncs ne- nec nee nek nel nen ner nes nkc nke nkk nkn nkr nks nlc nle nlk nll nln nlr nls nnc nne nnk nnl nnn nns nrc nre nrk nrl nrn nrr nrs nsc nse nsk nsl nsn nsr nss rcc rce rcl rcn rcr rcs re- rec ree rek rel ren rer res rkc rke rkk rks rlc rle rll rln rlr rls rnc rnn rnr rns rrc rrk rrl rrn rrr rrs rsc rse rsk rsl rsn rsr rss scc sce sck scl scn scr scs se- sec see sek sel sen ser ses sk- skc ske skk skl skr sks slc sle slk sll sln slr sls snc sne snk snl snn snr sns sr- src sre srk srl srn srr srs ss- ssc sse ssk ssl ssn ssr sss