-er c-- ccc cce ccl ccr ccs cct ce- cec cee cel cer ces cet cl- clc cle cll clr cls clt crc cre crl crr crs crt csc cse csl csr css cst ctc cte ctl ctr cts ctt ec- ecc ece ecl ecr ecs ect eec eee eel eer ees eet elc ele ell elr els elt erc ere erl err ers ert es- esc ese esl esr ess est etc ete etl etr ets ett lcc lce lcl lcr lcs lct lec lee lel ler les let llc lle lll llr lls llt lrc lrr lrs lrt lsc lse lsl lsr lss lst ltc lte ltl ltr lts ltt rcc rce rcl rcr rcs rct re- rec ree rel rer res ret rlc rle rll rlr rls rlt rrc rrl rrr rrs rrt rsc rse rsl rsr rss rst rtc rte rtl rtr rts rtt scc sce scl scr scs sct se- sec see sel ser ses set slc sle sll slr sls slt sr- src sre srl srr srs srt ss- ssc sse ssl ssr sss sst stc ste stl str sts stt tcc tce tcl tcr tcs tct te- tec tee tel ter tes tet tlc tle tll tlr tls tlt trc tre trl trr trs trt tsc tse tsl tsr tss tst ttc tte ttl ttr tts ttt