Once a valid number is entered, the program should display a grid of horizontal and vertical lines inside the frame. These lines should be drawn such that:
• The lines create x number of horizontal and x number of vertical boxes, where x is the number entered by the user.
• Each box should be 100 pixels by 100 pixels
• The grid is spaced inside the frame such that it is perfectly centered both
horizontally and vertically, with a 10 pixel border between the edge of the frame and the grid.
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