-er c-- ccc ccd cce cck ccl ccr ccs cdc cdd cde cdk cdl cdr cds ce- cec ced cee cek cel cer ces ckc ckd cks cl- clc cld cle clk cll clr cls crc crd cre crk crl crr crs csc csd cse csk csl csr css dcc dcd dce dck dcl dcr dcs ddc ddd dde ddk ddl ddr dds de- dec ded dee dek del der des dkc dke dkk dkl dkr dks dl- dlc dld dle dlk dll dlr dls drc drd dre drk drl drr drs dsc dsd dse dsk dsl dsr dss ec- ecc ecd ece eck ecl ecr ecs ed- edc edd ede edk edl edr eds eec eed eee eek eel eer ees ekc ekd eke ekl ekr eks elc eld ele elk ell elr els erc erd ere erk erl err ers es- esc esd ese esk esl esr ess kcc kcd kce kck kcl kcr kcs kdc kde kdk kdl kdr kds ke- kec ked kee kek kel ker kes kkc kke kkk kkl kkr kks kl- klc kld klr kls krc krd krk krl krr krs ksc ksd kse ksk ksl ksr kss lcc lcd lce lck lcl lcr lcs ldc ldd lde ldk ldl ldr lds lec led lee lek lel ler les lkl lkr lks llc lld lle llk lll llr lls lrc lrd lrk lrr lrs lsc lsd lse lsk lsl lsr lss rcc rcd rce rcl rcr rcs rdc rdd rde rdl rdr rds re- rec red ree rek rel rer res rkc rke rkk rks rlc rld rle rll rlr rls rrc rrd rrk rrl rrr rrs rsc rsd rse rsk rsl rsr rss scc scd sce sck scl scr scs sdc sdd sde sdk sdl sdr sds se- sec sed see sek sel ser ses sk- skc skd ske skk skl skr sks slc sld sle slk sll slr sls sr- src srd sre srk srl srr srs ss- ssc ssd sse ssk ssl ssr sss