How does 'route' layer , 'yolo' layer work in yolov3?

How does 'route' layer work in yolov2,v3? How does 'yolo' layer work in yolov3? in cfg file [yolo] mask = 6,7,8 anchors = 10,13,  16,30,  33,23,  30,61,  62,45,  59,119,  116,90,  156,198,  373,326 cl

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