-er c-- ccc ccd cce ccn ccr cct cdc cdd cde cdn cdr cdt ce- cec ced cee cen cer cet cn- cnc cnd cne cnn cnr cnt crc crd cre crn crr crt ctc ctd cte ctn ctr ctt dcc dcd dce dcn dcr dct ddc ddd dde ddn ddr ddt de- dec ded dee den der det dnc dnd dne dnn dnr dnt drc drd dre drn drr drt dtc dtd dte dtn dtr dtt ec- ecc ecd ece ecn ecr ect ed- edc edd ede edn edr edt eec eed eee een eer eet en- enc end ene enn enr ent erc erd ere ern err ert etc etd ete etn etr ett ncc ncd nce ncn ncr nct ndc ndd nde ndn ndr ndt ne- nec ned nee nen ner net nnc nne nnn nnt nrc nrd nre nrn nrr nrt ntc ntd nte ntn ntr ntt rcc rcd rce rcn rcr rct rdc rdd rde rdn rdr rdt re- rec red ree ren rer ret rnc rnd rnn rnr rnt rrc rrd rrn rrr rrt rtc rtd rte rtn rtr rtt tcc tcd tce tcn tcr tct tdc tdd tde tdn tdr tdt te- tec ted tee ten ter tet tnc tnd tne tnn tnr tnt trc trd tre trn trr trt ttc ttd tte ttn ttr ttt