Train Loop/en

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Instructions

Trainloop.png

Place some blocks in the grid, in the size of 1x2 or 1x3. Each given digit must belong to exactly one block, but there may be block that do not contain any digit. Blocks cannot overlap each other. Number in a block represents the length of possible movements of that block, in the direction of its short edge. After all blocks are placed, remaining cells should be interconnected.