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Coral (First Seen) (1243)
Instruction:
Shade some cells such that all shaded cells are connected orthogonally into a single region. All non-shaded cells must be connected orthogonally (through other non-shaded cells) to the edge of the grid. No 2×2 group of cells can be entirely shaded. Some cells may already be shaded.
Some cells might be marked with a cross; do not shade those cells.
Each number outside the main grid represents the length of the first group of contiguous shaded cells in the corresponding row (or column), when encountered from the side that the number is on.
It is possible that not all rows and columns have given numbers. It is up to you to determine what cells to shade without that information.