-er c-- ccc cce ccf ccl ccp ccr ce- cec cee cef cel cep cer cfc cfe cff cfl cfp cfr cl- clc cle clf cll clp clr cpc cpe cpf cpl cpp cpr crc cre crf crl crp crr ec- ecc ece ecf ecl ecr eec eee eef eel eep eer ef- efc efe eff efl efp efr elc ele elf ell elp elr ep- epc epe epf epl epp epr erc ere erf erl erp err fcc fce fcf fcl fcp fcr fec fee fef fel fep fer ffc ffe fff ffl ffp ffr flc fle flf fll flp flr fpc fpe fpl fpp fpr frc fre frf frl frp frr l-p lcc lce lcf lcl lcp lcr lec lee lef lel lep ler lfc lfe lff lfl lfp lfr llc lle llf lll llp llr lpc lpe lpf lpl lpp lpr lrc lrf lrp lrr p-p pcc pce pcf pcl pcp pcr pec pee pef pel pep per pfc pfe pff pfl pfp pfr plc ple plf pll plp plr ppc ppe ppf ppl ppp ppr prc pre prf prl prp prr rcc rce rcf rcl rcp rcr re- rec ree ref rel rep rer rfc rfe rff rfl rfp rfr rlc rle rlf rll rlp rlr rpc rpe rpf rpl rpp rpr rrc rrf rrl rrp rrr