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ILX (751)
Instruction:
Place letters I, L and X in the grid (maximum one letter per cell) so that each letter appears exactly ones in each row and column.
Then draw a single closed loop travelling vertically and horizontally between centers of the adjacent cells. The loop cannot visit painted cells and the cells containing letter X and has to visit all the other cells exactly ones. The loop has to make right turn in cells with letter L and has to go straight in cells with letters I. The hints around the grid show the order in which the letters appear in the given row and column (from left to right resp. top to bottom).