c-- ccc cce ccl ccn ccs ccx ce- cec cee cel cen ces cex cl- clc cle cll cln cls clx cn- cnc cne cnl cnn cns cnx csc cse csl csn css csx cxc cxl cxs cxx ec- ecc ece ecl ecn ecs ecx eec eee eel een ees eex elc ele ell eln els elx en- enc ene enl enn ens es- esc ese esl esn ess esx ex- exc exe exl exs exx lcc lce lcl lcn lcs lcx lec lee lel len les lex llc lle lll lln lls lnc lne lnl lnn lns lsc lse lsl lsn lss lxc lxx ncc nce ncl ncn ncs ncx ne- nec nee nel nen nes nex nlc nle nll nln nls nlx nnc nne nnl nnn nns nsc nse nsl nsn nss nsx nxc nxl scc sce scl scn scs scx se- sec see sel sen ses sex slc sle sll sln sls slx snc sne snl snn sns ss- ssc sse ssl ssn sss ssx sxc sxl sxn sxs xcl xcx xee xel xen xes xex xls xnc xns xsc xsl xss xxl xxx