box in box by dcutter

say "[][][][][][][][][][][][][][][][][][][][][][][][][][][][][][][][][][][][][][][][][]\x0d
[]              []              []              []              []              []\x0d
[]              []              []              []              []              []\x0d
[]              []              []              []              []              []\x0d
[]              []              []              []              []              []\x0d
[]              []              []              []              []              []\x0d
[]              []              []              []              []              []\x0d
[]              []              []              []              []              []\x0d
[][][][][][][][][][][][][][][][][][][][][][][][][][][][][][][][][][][][][][][][][]\x0d
[]              []          []          []          []          []              []\x0d
[]              []          []          []          []          []              []\x0d
[]              []          []          []          []          []              []\x0d
[]              []          []          []          []          []              []\x0d
[]              []          []          []          []          []              []\x0d
[]              [][][][][][][][][][][][][][][][][][][][][][][][][]              []\x0d
[]              []          []      []      []      []          []              []\x0d
[][][][][][][][][]          []      []      []      []          [][][][][][][][][]\x0d
[]              []          []      []      []      []          []              []\x0d
[]              []          [][][][][][][][][][][][][]          []              []\x0d
[]              []          []      []  []  []      []          []              []\x0d
[]              [][][][][][][]      [][][][][]      [][][][][][][]              []\x0d
[]              []          []      []  []  []      []          []              []\x0d
[]              []          [][][][][][][][][][][][][]          []              []\x0d
[]              []          []      []      []      []          []              []\x0d
[][][][][][][][][]          []      []      []      []          [][][][][][][][][]\x0d
[]              []          []      []      []      []          []              []\x0d
[]              [][][][][][][][][][][][][][][][][][][][][][][][][]              []\x0d
[]              []          []          []          []          []              []\x0d
[]              []          []          []          []          []              []\x0d
[]              []          []          []          []          []              []\x0d
[]              []          []          []          []          []              []\x0d
[]              []          []          []          []          []              []\x0d
[][][][][][][][][][][][][][][][][][][][][][][][][][][][][][][][][][][][][][][][][]\x0d
[]              []              []              []              []              []\x0d
[]              []              []              []              []              []\x0d
[]              []              []              []              []              []\x0d
[]              []              []              []              []              []\x0d
[]              []              []              []              []              []\x0d
[]              []              []              []              []              []\x0d
[]              []              []              []              []              []\x0d
[][][][][][][][][][][][][][][][][][][][][][][][][][][][][][][][][][][][][][][][][]"

Note that non-ascii characters in the above source code will be escaped (such as \x9f).

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