-er c-- ccc cce ccf ccl ccr ccs cct ce- cec cee cef cel cer ces cet cfc cfe cff cfl cfr cfs cft cl- clc cle clf cll clr cls clt crc cre crf crl crr crs crt csc cse csf csl csr css cst ctc cte ctf ctl ctr cts ctt ec- ecc ece ecf ecl ecr ecs ect eec eee eef eel eer ees eet ef- efc efe eff efl efr efs eft elc ele elf ell elr els elt erc ere erf erl err ers ert es- esc ese esf esl esr ess est etc ete etf etl etr ets ett fcc fce fcf fcl fcr fcs fct fec fee fef fel fer fes fet ffc ffe fff ffl ffr ffs fft flc fle flf fll flr fls flt frc fre frf frl frr frs frt fsc fse fsf fsl fsr fss fst ftc fte ftf ftl ftr fts ftt lcc lce lcf lcl lcr lcs lct lec lee lef lel ler les let lfc lfe lff lfl lfr lfs lft llc lle llf lll llr lls llt lrc lrf lrr lrs lrt lsc lse lsf lsl lsr lss lst ltc lte ltf ltl ltr lts ltt rcc rce rcf rcl rcr rcs rct re- rec ree ref rel rer res ret rfc rfe rff rfl rfr rfs rft rlc rle rlf rll rlr rls rlt rrc rrf rrl rrr rrs rrt rsc rse rsf rsl rsr rss rst rtc rte rtf rtl rtr rts rtt scc sce scf scl scr scs sct se- sec see sef sel ser ses set sfc sfe sff sfl sfr sfs sft slc sle slf sll slr sls slt sr- src sre srf srl srr srs srt ss- ssc sse ssf ssl ssr sss sst stc ste stf stl str sts stt tcc tce tcf tcl tcr tcs tct te- tec tee tef tel ter tes tet tfc tfe tff tfl tfr tfs tft tlc tle tlf tll tlr tls tlt trc tre trf trl trr trs trt tsc tse tsf tsl tsr tss tst ttc tte ttf ttl ttr tts ttt