private int SizeOfBasin(Point2 point, Grid2 <int> grid, bool[,] visited)
{
int size = 0;
if (grid[point] != 9 && !visited[point.X, point.Y])
{
visited[point.X, point.Y] = true;
size = point.Adjacent(grid.Bounds).Sum(adj => SizeOfBasin(adj, grid, visited)) + 1;
}
return(size);
}