If the coefficient of \( x^{4} \) in the expansion \( \left(1+x-2 x^{2}\right)^{6} \) is \( a \)...

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If the coefficient of \( x^{4} \) in the expansion \( \left(1+x-2 x^{2}\right)^{6} \) is \( a \), then \( |a|-40 \) is
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