-er c-- ccc ccd cce cck ccn ccr cdc cdd cde cdk cdn cdr ce- cec ced cee cek cen cer ckc ckd cn- cnc cnd cne cnn cnr crc crd cre crk crn crr dcc dcd dce dck dcn dcr ddc ddd dde ddk ddn ddr de- dec ded dee dek den der dkc dke dkk dkr dnc dnd dne dnk dnn dnr drc drd dre drk drn drr ec- ecc ecd ece eck ecn ecr ed- edc edd ede edk edn edr eec eed eee eek een eer ekc ekd eke ekr en- enc end ene enk enn enr erc erd ere erk ern err kcc kcd kce kck kcn kcr kdc kde kdk kdr ke- kec ked kee kek ken ker kkc kke kkk kkn kkr kn- knc knd kne knk knn knr krc krd krk krn krr ncc ncd nce nck ncn ncr ndc ndd nde ndk ndn ndr ne- nec ned nee nek nen ner nkc nke nkk nkn nkr nnc nne nnk nnn nrc nrd nre nrk nrn nrr rcc rcd rce rcn rcr rdc rdd rde rdn rdr re- rec red ree rek ren rer rkc rke rkk rnc rnd rnn rnr rrc rrd rrk rrn rrr