fn countOccupied(self: @This()) usize {

    fn countOccupied(self: *const @This()) usize {

    fn adjacentOccupied(self: @This(), row: usize, col: usize) u4 {

    fn adjacentOccupied(self: *const @This(), row: usize, col: usize) u4 {

    fn seenOccupied(self: @This(), row: usize, col: usize) u4 {

    fn seenOccupied(self: *const @This(), row: usize, col: usize) u4 {

    _ = allocator;