-er c-- ccc cce ccf ccl ccn ccr ce- cec cee cef cel cen cer cfc cfe cff cfl cfn cfr cl- clc cle clf cll cln clr cn- cnc cne cnf cnl cnn cnr crc cre crf crl crn crr ec- ecc ece ecf ecl ecn ecr eec eee eef eel een eer ef- efc efe eff efl efr elc ele elf ell eln elr en- enc ene enf enl enn enr erc ere erf erl ern err fcc fce fcf fcl fcn fcr fec fee fef fel fen fer ffc ffe fff ffl ffn ffr flc fle flf fll fln flr fnc fne fnf fnl fnn fnr frc fre frf frl frn frr lcc lce lcf lcl lcn lcr lec lee lef lel len ler lfc lfe lff lfl lfn lfr llc lle llf lll lln llr lnc lne lnl lnn lnr lrc lrf lrn lrr ncc nce ncf ncl ncn ncr ne- nec nee nef nel nen ner nfc nfe nff nfl nfn nfr nlc nle nlf nll nln nlr nnc nne nnf nnl nnn nrc nre nrf nrl nrn nrr rcc rce rcf rcl rcn rcr re- rec ree ref rel ren rer rfc rfe rff rfl rfn rfr rlc rle rlf rll rln rlr rnc rnn rnr rrc rrf rrl rrn rrr