-er c-- ccc ccd cce ccg ccr cdc cdd cde cdg cdr ce- cec ced cee ceg cer cgc cgd cge cgg cgr crc crd cre crg crr dcc dcd dce dcg dcr ddc ddd dde ddg ddr de- dec ded dee deg der dgc dgd dge dgg dgr drc drd dre drg drr ec- ecc ecd ece ecg ecr ed- edc edd ede edg edr eec eed eee eeg eer egc egd ege egg egr erc erd ere erg err g-d gcc gcd gce gcg gcr gdc gdd gde gdr ge- gec ged gee geg ger ggc ggd ggg ggr grc grd gre grg grr rcc rcd rce rcg rcr rdc rdd rde rdg rdr re- rec red ree reg rer rgc rgd rge rgg rgr rrc rrd rrg rrr