or download this
$x_dimension = 5;
$y_dimension = 4;
...
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+000000000000000000000000000000000
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+000000000000000000000000000000000000000000000000000000000000000000000
+000000000000000000000000000000000000000000000000000000000000000000000
+000000000000000000000000000000000000000000000000000000000000000000000
+00000000'