Rules: Place a few tetrominoes into the given grid. Tetrominoes can only touch each other diagonally. Given letters must overlap with the tetromino they represent. A tetromino may contain one or more or no givens. 'X'-marked cells, if given, cannot be used. It must be possible to draw a loop that does not interset itself and moves horizontally or vertically between centers of cells and visits each tetromino once. The loop must enter and exit every tetromino in its dead-end cells, and must visit exactly one empty cell during every changeover between two tetrominoes.
About: This puzzle type was invented by Anurag Sahay.
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