The IMO Begins

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The 21st century MOSP calendar is overflowing! Can you help them figure out when the IMO starts?

  • The board is initially empty (i.e. has no stones).
  • Each minute, if there is an L-shaped tromino region of three cells on the board (rotations are allowed) ...
  • You should stop after eight minutes.
  • There should be exactly one completely filled row and one completely filled column.