If 2 or more lines have been draw and the area is not closed, A will draw a line from the current point back to the starting point, completing the area.
Example:
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Type 20.
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Press 'Right'.
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Press 'Enter'.
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Type 20.
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Press 'Down'.
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Press 'Enter'.
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Press 'A'.
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Notice the cursor went from the current location back to the beginning.