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Sky coral (672)
Instruction:
Blacken some of the cells to create a coral. All black cells in must be orthogonally connected. There must be no 2x2 squares of black cells. And all white cells must be connected to the edge of the grid. There are some blocks of black cells in each row and column separated by white cells. The lengths of the blocks represent also their height. The numbers at the borders indicate how many blocks are visible from the given viewpoint.