Fill every row, column and bold-outlined region with the digits 1-9 once each. Cells separated by an X must contain digits summing to 10. Shade one tetromino in each region such that all shaded cells form one orthogonally connected area. Tetrominoes of the same shape may not share a border (counting rotations and reflections as the same). No 2x2 area may be entirely shaded. Additionally, each tetromino must contain digits summing to less than 13.
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