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Keep the number of lines to flip as a negative num
Keep track of the number of lines to flip on the reverse page using a negative number. This uses the ill-advised principle of overloading the meaning of a variable. Still, it kind of makes sense because these lines are upside down, so the number should be "upside down" too. Besides, leaving it as a positive number trips up the code which does page padding, which would require even more special case code.
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