Easy as LITS Instructions

The objective is to shade four connected cells in each shape, subject to the following rules:

1. No two of the same tetrominos, including rotations / reflections are allowed to touch.
2. All shaded cells must connect horizontally or vertically upon completion.
3. No 2x2 area of shaded cells is allowed.
4. Letters outside the grid indicate the first tetromino encountered in the corresponding direction.