This is an old statistical technique.

You need to know ahead of time which answer is more likely and have a
bias in your randomizer. A classic example:

        Did you cheat on your wife last year? If you were born
        between January and September reverse your answer.


--
 Julian Assange        |If you want to build a ship, don't drum up people
                       |together to collect wood or assign them tasks and
 [EMAIL PROTECTED]          |work, but rather teach them to long for the endless
 [EMAIL PROTECTED]  |immensity of the sea. -- Antoine de Saint Exupery

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