Rules: Shade in some cells such that each outlined area contains six shaded cells that form a Tetromino and a half of a tetromino, with the two shapes allowed to touch orthogonally as long as they are not identical. The other half of the tetromino must be found in an adjoining region - a half can only be adjacent to the half it is joining, not any other halves. Also, the two cells making a "half " need not necessarily be adjacent to each other. No 2×2 square can be shaded completely. All shapes must be connected to form a single contiguous group of shaded cells. Identical figures, regardless of rotation or reflection, cannot share an edge.
See example below:
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