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- The background of the sandpaper surface, where the grains of sand on the sandpaper can be seen, and the difference in colors on the sandpaper indicate the fineness of the grains of sand. Puzzle #480750818
The background of the sandpaper surface, where the grains of sand on the sandpaper can be seen, and the difference in colors on the sandpaper indicate the fineness of the grains of sand. Puzzle #480750818