-er c-- ccc cce cck ccl ccr ccs cct ce- cec cee cek cel cer ces cet ckc cks ckt cl- clc cle clk cll clr cls clt crc cre crk crl crr crs crt csc cse csk csl csr css cst ctc cte ctk ctl ctr cts ctt ec- ecc ece eck ecl ecr ecs ect eec eee eek eel eer ees eet ekc eke ekl ekr eks ekt elc ele elk ell elr els elt erc ere erk erl err ers ert es- esc ese esk esl esr ess est etc ete etk etl etr ets ett k-t kcc kce kck kcl kcr kcs kct ke- kec kee kek kel ker kes ket kkc kke kkk kkl kkr kks kkt kl- klc klr kls klt krc krk krl krr krs krt ksc kse ksk ksl ksr kss kst ktc kte ktk ktl ktr kts ktt lcc lce lck lcl lcr lcs lct lec lee lek lel ler les let lkl lkr lks lkt llc lle llk lll llr lls llt lrc lrk lrr lrs lrt lsc lse lsk lsl lsr lss lst ltc lte ltk ltl ltr lts ltt rcc rce rcl rcr rcs rct re- rec ree rek rel rer res ret rkc rke rkk rks rkt rlc rle rll rlr rls rlt rrc rrk rrl rrr rrs rrt rsc rse rsk rsl rsr rss rst rtc rte rtk rtl rtr rts rtt scc sce sck scl scr scs sct se- sec see sek sel ser ses set sk- skc ske skk skl skr sks skt slc sle slk sll slr sls slt sr- src sre srk srl srr srs srt ss- ssc sse ssk ssl ssr sss sst stc ste stk stl str sts stt tcc tce tck tcl tcr tcs tct te- tec tee tek tel ter tes tet tkc tke tkk tkl tkr tks tkt tlc tle tlk tll tlr tls tlt trc tre trk trl trr trs trt tsc tse tsk tsl tsr tss tst ttc tte ttk ttl ttr tts ttt