c-- ccc cce ccl ccs cct ccx ce- cec cee cel ces cet cex cl- clc cle cll cls clt clx csc cse csl css cst csx ctc cte ctl cts ctt ctx cxc cxl cxs cxt cxx ec- ecc ece ecl ecs ect ecx eec eee eel ees eet eex elc ele ell els elt elx es- esc ese esl ess est esx etc ete etl ets ett etx ex- exc exe exl exs ext exx lcc lce lcl lcs lct lcx lec lee lel les let lex llc lle lll lls llt lsc lse lsl lss lst ltc lte ltl lts ltt ltx lxc lxx scc sce scl scs sct scx se- sec see sel ses set sex slc sle sll sls slt slx ss- ssc sse ssl sss sst ssx stc ste stl sts stt stx sxc sxl sxs sxt t-x tcc tce tcl tcs tct tcx te- tec tee tel tes tet tex tlc tle tll tls tlt tlx tsc tse tsl tss tst tsx ttc tte ttl tts ttt ttx txe txl txs txt xcl xcx xee xel xes xet xex xls xlt xsc xsl xss xst xtc xts xtx xxl xxx