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图中除A、B、C、D四方格外,其它各方格都与指向它的粗,细箭头有一定的规律,请找出其规律并指出圆圈内应是什么数?有粗有细@瞿文华
In addition to the squares A, B, C, and D in the figure, all the other squares have certain rules with respect to the thick and thin arrows pointing to it. Please find out the rules and indicate what number should be in the circle.