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If alpha, beta are the roots of x^(2) - ...

If `alpha, beta` are the roots of `x^(2) - px + q = 0` and `alpha', beta'` are the roots of `x^(2) - p' x + q' = 0`, then the value of `(alpha - alpha')^(2) + (beta -alpha')^(2) + (alpha - beta')^(2) + (beta - beta')^(2)` is

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