Question: Let A be a polynomial-time one-sided error Monte Carlo algorithm that decides a language L so that on every string x, if x L then

Let A be a polynomial-time one-sided error Monte Carlo algorithm that decides a language L so that on every string x, if x L then A returns the answer yes with probability 0.5; if x / L then A returns the answer no with probability 1. Describe a polynomial-time randomized algorithm B that uses A (as a subroutine) to decide L with probability of success at least 0.9.

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