c-- ccc cce ccl ccs ccx ce- cec cee cel ces cex cl- clc cle cll cls clx csc cse csl css csx cxc cxl cxs cxx ec- ecc ece ecl ecs ecx eec eee eel ees eex elc ele ell els elx es- esc ese esl ess esx ex- exc exe exl exs exx lcc lce lcl lcs lcx lec lee lel les lex llc lle lll lls lsc lse lsl lss lxc lxx scc sce scl scs scx se- sec see sel ses sex slc sle sll sls slx ss- ssc sse ssl sss ssx sxc sxl sxs xcl xcx xee xel xes xex xls xsc xsl xss xxl xxx