c-- ccc cce ccl ccp ccx ce- cec cee cel cep cex cl- clc cle cll clp clx cpc cpe cpl cpp cpx cxc cxl cxp cxx ec- ecc ece ecl ecx eec eee eel eep eex elc ele ell elp elx ep- epc epe epl epp epx ex- exc exe exl exp exx l-p lcc lce lcl lcp lcx lec lee lel lep lex llc lle lll llp lpc lpe lpl lpp lpx lxc lxx p-p pcc pce pcl pcp pcx pec pee pel pep pex plc ple pll plp plx ppc ppe ppl ppp ppx pxc pxe pxl xcl xcp xcx xee xel xep xex xpc xpe xpl xpp xxl xxp xxx