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A character can move around on a two-dimensional (x,y) coordinate grid. Some points are dangerous and contain land mines. To know which points are safe, we check whether the sum of the digits of abs(x) plus the sum (x-1, y) are less than or equal to 23. The origin of a graph in the real world should be the coordinate at the centre of the grid. We can use the same logic to translate a coordinate on a real-world graph into our grid by adding the coordinates on a 2D grid.