-er a-a a-c aaa aac aad aae aan aar ac- aca acc acd ace acn acr ad- ada adc add ade adn adr aea aec aed aee aen aer an- ana anc and ane ann anr ar- ara arc ard are arn arr c-- caa cac cad cae can car cca ccc ccd cce ccn ccr cda cdc cdd cde cdn cdr ce- cea cec ced cee cen cer cn- cna cnc cnd cne cnn cnr cra crc crd cre crn crr daa dac dad dae dan dar dca dcc dcd dce dcn dcr dda ddc ddd dde ddn ddr de- dea dec ded dee den der dna dnc dnd dne dnn dnr dra drc drd dre drn drr eaa eac ead eae ean ear ec- eca ecc ecd ece ecn ecr ed- eda edc edd ede edn edr eea eec eed eee een eer en- ena enc end ene enn enr era erc erd ere ern err naa nac nad nae nan nar nca ncc ncd nce ncn ncr nda ndc ndd nde ndn ndr ne- nea nec ned nee nen ner nna nnc nne nnn nra nrc nrd nre nrn nrr ra- raa rac rad rae ran rar rca rcc rcd rce rcn rcr rda rdc rdd rde rdn rdr re- rea rec red ree ren rer rna rnc rnd rnn rnr rra rrc rrd rrn rrr