-er c-- ccc cce ccf ccn ccr ce- cec cee cef cen cer cfc cfe cff cfn cfr cn- cnc cne cnf cnn cnr crc cre crf crn crr ec- ecc ece ecf ecn ecr eec eee eef een eer ef- efc efe eff efr en- enc ene enf enn enr erc ere erf ern err fcc fce fcf fcn fcr fec fee fef fen fer ffc ffe fff ffn ffr fnc fne fnf fnn fnr frc fre frf frn frr ncc nce ncf ncn ncr ne- nec nee nef nen ner nfc nfe nff nfn nfr nnc nne nnf nnn nrc nre nrf nrn nrr rcc rce rcf rcn rcr re- rec ree ref ren rer rfc rfe rff rfn rfr rnc rnn rnr rrc rrf rrn rrr