c-- ccc cce ccl ccn cct ccx ce- cec cee cel cen cet cex cl- clc cle cll cln clt clx cn- cnc cne cnl cnn cnt cnx ctc cte ctl ctn ctt ctx cxc cxl cxt cxx ec- ecc ece ecl ecn ect ecx eec eee eel een eet eex elc ele ell eln elt elx en- enc ene enl enn ent etc ete etl etn ett etx ex- exc exe exl ext exx lcc lce lcl lcn lct lcx lec lee lel len let lex llc lle lll lln llt lnc lne lnl lnn lnt ltc lte ltl ltt ltx lxc lxx ncc nce ncl ncn nct ncx ne- nec nee nel nen net nex nlc nle nll nln nlt nlx nnc nne nnl nnn nnt ntc nte ntn ntt ntx nxc nxl nxt t-x tcc tce tcl tcn tct tcx te- tec tee tel ten tet tex tlc tle tll tln tlt tlx tnc tne tnl tnn tnt tnx ttc tte ttl ttn ttt ttx txe txl txn txt xcl xcx xee xel xen xet xex xlt xnc xtc xtx xxl xxx