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Inner coral (687)
Instruction:
Blacken some of the cells in the grid to create a coral. All black cells in the coral 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. Hints in the shaded cells denote the lengths of the first coral segments visible from this cell in the four directions (vertically and horizontally) in no particular order