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Perturb generally means to give slight randomization. For instance, if a valid value is in the range of 10-12 and you want to test values slightly outside of the valid range, you might 'perturb' the values to the range of 9-13.
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It is not that old programmers are any smarter or code better, it is just that they have made the same stupid mistake so many times that it is second nature to fix it.
--Mitakeet
The reasonable man adapts himself to the world; the unreasonable one persists in trying to adapt the world to himself. Therefore, all progress depends on the unreasonable man.
--George Bernard Shaw
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