(Control a moving text) Write a program that displays a moving text, as shown in Figure 1a and b. The text moves from left to right circularly. When it disappears in the right, it reappears from the left. The text freezes when the mouse is pressed and moves again when the button is released.
FIGURE 1 (a and b) A text is moving from left to right circularly. (c) The program simulates a fan running.

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