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1.1     ! bowersj2    1: The formula evaluator can not handle things of the form {}``x + - y''.
        !             2: If you have a random variable that may be positive or negative (as in the
        !             3: example following this section), you can try wrapping the references to that
        !             4: variable in parenthesis. As always, it is a good idea to try out several
        !             5: randomized versions of your problems to make sure everything works correctly.