-er c-- ccc ccd cce ccf ccn ccr cdc cdd cde cdf cdn cdr ce- cec ced cee cef cen cer cfc cfd cfe cff cfn cfr cn- cnc cnd cne cnf cnn cnr crc crd cre crf crn crr dcc dcd dce dcf dcn dcr ddc ddd dde ddf ddn ddr de- dec ded dee def den der dfc dfd dfe dff dfn dfr dnc dnd dne dnf dnn dnr drc drd dre drn drr ec- ecc ecd ece ecf ecn ecr ed- edc edd ede edf edn edr eec eed eee eef een eer ef- efc efd efe eff efr en- enc end ene enf enn enr erc erd ere erf ern err fcc fcd fce fcf fcn fcr fdc fdd fde fdf fdn fdr fec fed fee fef fen fer ffc ffd ffe fff ffn ffr fnc fnd fne fnf fnn fnr frc frd fre frf frn frr ncc ncd nce ncf ncn ncr ndc ndd nde ndf ndn ndr ne- nec ned nee nef nen ner nfc nfd nfe nff nfn nfr nnc nne nnf nnn nrc nrd nre nrf nrn nrr rcc rcd rce rcf rcn rcr rdc rdd rde rdf rdn rdr re- rec red ree ref ren rer rfc rfd rfe rff rfn rfr rnc rnd rnn rnr rrc rrd rrf rrn rrr