-er c-- ccc cce ccl ccp ccr ccx ce- cec cee cel cep cer cex cl- clc cle cll clp clr clx cpc cpe cpl cpp cpr cpx crc cre crl crp crr crx cxc cxl cxp cxr cxx ec- ecc ece ecl ecr ecx eec eee eel eep eer eex elc ele ell elp elr elx ep- epc epe epl epp epr epx erc ere erl erp err ex- exc exe exl exp exr exx l-p lcc lce lcl lcp lcr lcx lec lee lel lep ler lex llc lle lll llp llr lpc lpe lpl lpp lpr lpx lrc lrp lrr lxc lxr lxx p-p pcc pce pcl pcp pcr pcx pec pee pel pep per pex plc ple pll plp plr plx ppc ppe ppl ppp ppr ppx prc pre prl prp prr prx pxc pxe pxl pxr rcc rce rcl rcp rcr rcx re- rec ree rel rep rer rex rlc rle rll rlp rlr rpc rpe rpl rpp rpr rpx rrc rrl rrp rrr rxp rxr xcl xcp xcr xcx xee xel xep xer xex xlr xpc xpe xpl xpp xrc xrx xxl xxp xxx