Today's offering is an unmissable cave puzzle that has regions as givens.
Rules: Shade in exactly four cells in each bold outlined region, to leave behind a single connected group of shaded cells, with no enclosed, shaded cells. In other words, all unshaded cells must be connected through other unshaded cells to an edge of the grid. Also, it must be possible to split the shaded region into tetrominoes L, I, T ,S and O, each shape contained in one outlined region, such that no two identical tetrominoes share an edge.
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