-er a-a a-c aaa aac aad aae aaf aan aar ac- aca acc acd ace acf acn acr ad- ada adc add ade adf adn adr aea aec aed aee aef aen aer af- afa afc afd afe aff afn afr an- ana anc and ane anf ann anr ar- ara arc ard are arf arn arr c-- caa cac cad cae caf can car cca ccc ccd cce ccf ccn ccr cda cdc cdd cde cdf cdn cdr ce- cea cec ced cee cef cen cer cfa cfc cfd cfe cff cfn cfr cn- cna cnc cnd cne cnf cnn cnr cra crc crd cre crf crn crr daa dac dad dae daf dan dar dca dcc dcd dce dcf dcn dcr dda ddc ddd dde ddf ddn ddr de- dea dec ded dee def den der dfa dfc dfd dfe dff dfn dfr dna dnc dnd dne dnf dnn dnr dra drc drd dre drn drr eaa eac ead eae eaf ean ear ec- eca ecc ecd ece ecf ecn ecr ed- eda edc edd ede edf edn edr eea eec eed eee eef een eer ef- efa efc efd efe eff efr en- ena enc end ene enf enn enr era erc erd ere erf ern err faa fac fad fae faf fan far fca fcc fcd fce fcf fcn fcr fda fdc fdd fde fdf fdn fdr fea fec fed fee fef fen fer ffa ffc ffd ffe fff ffn ffr fna fnc fnd fne fnf fnn fnr fra frc frd fre frf frn frr naa nac nad nae naf nan nar nca ncc ncd nce ncf ncn ncr nda ndc ndd nde ndf ndn ndr ne- nea nec ned nee nef nen ner nfa nfc nfd nfe nff nfn nfr nna nnc nne nnf nnn nra nrc nrd nre nrf nrn nrr ra- raa rac rad rae raf ran rar rca rcc rcd rce rcf rcn rcr rda rdc rdd rde rdf rdn rdr re- rea rec red ree ref ren rer rfa rfc rfd rfe rff rfn rfr rna rnc rnd rnn rnr rra rrc rrd rrf rrn rrr