#5 - LITS

This puzzle may not really have good aesthetics, but I am quite pleased with the logical flow of it.

Rules

Shade one tetromino of cells in each region so that all shaded cells form one orthogonally connected area. Two tetrominoes of the same shape may not share a bold border, counting rotations and reflections as the same. No 2x2 region may be entirely shaded.


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