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DOMINO puzzle consists of a rectangular grid, with each cell of the grid occupied by a single digit number. The grid represents
a set of domino pieces laid out in a rectangular array. For example, if you use a "standard" domino set having pieces ranging from 0-0 spots to 6-6 spots, then
the rectangle will be 8 cells across and 7 cells down. The puzzles can have different sizes, depending on the size of the domino set you use. To solve such a
puzzle, it is necessary to outline pairs of adjacent numbers in such a way that every piece of the domino set is revealed. Each puzzle has a unique solution,
and can be solved without recourse to guesswork.
Study the puzzle until you discover an adjacent pair of cells which you believe represent a domino piece. Then point the mouse cursor to approximately the mid-point
of the line separating the pair of cells, and click the mouse. This will remove the line. If you make an error, another mouse click in the same location will restore
the line.