For those who are interrested, here are some missing test-cases to add in
the original test script. (They cancelled some of my solutions...)

[<<END, 1],
 x x  x
   x
   x
   x
   x
   x
   x
   x
   x
x  x  x
END

[<<END, 0],
  x
x x xxx xx
xxx x x x
  xxx x
      xxx
  xxxxx x
  x   xxx
  x  xx x
xxx xxx
   x
END

--
|3eno�t, who'd better get back to work

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