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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def get_tiles(self):
 """Get all TileCoordinates contained in the region"""

        for x, y in griditer(self.root_tile.x, self.root_tile.y, ncol=self.tiles_per_row):
            yield TileCoordinate(self.root_tile.zoom, x, y)