-er c-- ccc cce ccl ccp ccr ce- cec cee cel cep cer cl- clc cle cll clp clr cpc cpe cpl cpp cpr crc cre crl crp crr ec- ecc ece ecl ecr eec eee eel eep eer elc ele ell elp elr ep- epc epe epl epp epr erc ere erl erp err l-p lcc lce lcl lcp lcr lec lee lel lep ler llc lle lll llp llr lpc lpe lpl lpp lpr lrc lrp lrr p-p pcc pce pcl pcp pcr pec pee pel pep per plc ple pll plp plr ppc ppe ppl ppp ppr prc pre prl prp prr rcc rce rcl rcp rcr re- rec ree rel rep rer rlc rle rll rlp rlr rpc rpe rpl rpp rpr rrc rrl rrp rrr