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my @grid = (
    # 0  1  2  3  4  5  
...
    [ 1, 0, 1, 0, 0, 0, ], 
    [ 0, 1, 1, 0, 0, 0, ],
);

my @grid = (
    # 0  1  2  3  4  5  
...
    [ 1, 1, 1, 1, 1, 1, ], 
    [ 1, 1, 0, 1, 1, 1, ],
);