LITS (Logical Puzzles Series #4)

There are many puzzles which remained unpublished for many years. Today LITS puzzle is one of the example of such puzzle which, I created long back but I have not published it. This is the reason I have started Logical Puzzles Series to re-publish these puzzles. LITS puzzle is one of my favorite puzzle and it recently appeared in Indian Sudoku Championship 2015.
Now I am publishing this LITS as 4th puzzle in Logical Puzzles Series.
Rules of LITS puzzle 
Blacken four cells in each outlined area so that each area includes one Tetromino shape. Tetrominoes may be rotated and/or mirrored. Blackened cells should form a single interconnected area which does not have any 2x2 square fully painted black. Same tetrominoes cannot touch each other from the sides, but they may touch each other diagonally.
Next Logical Puzzles Series puzzle Easy As Jigsaw ABC (Logical Puzzles Series #5)

Solution of Daily Sudoku League puzzle titled XV Sudoku (Daily Sudoku League #126)
XV Sudoku (Daily Sudoku League #126) Solution
XV Sudoku (Daily Sudoku League #126) Solution

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