数回 (Fences/Slightherlink)
把点与点以直线和横线相连，使之成为一个封闭单线回路。数字代表回路在其四周占据的边的数目。在没有数字的地方，划线的数目没有任何限制，而0的四周则不能有任何划线。回路不能交叉。
Draw a single continuous loop along the gridlines in the diagram.
You do not need to visit all grid points.
The numbers in each cell indicate how many of that cell's edges are used by the path.
The path cannot cross or touch itself.
把点与点以直线和横线相连，使之成为一个封闭单线回路。数字代表回路在其四周占据的边的数目。在没有数字的地方，划线的数目没有任何限制，而0的四周则不能有任何划线。回路不能交叉。
Draw a single continuous loop along the gridlines in the diagram.
You do not need to visit all grid points.
The numbers in each cell indicate how many of that cell's edges are used by the path.
The path cannot cross or touch itself.
