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What is the adjugate of the following?
\begin{bmatrix} 4 & 3 \\ 2 & 1 \end{bmatrix}
\begin{bmatrix} -1 & -2 \\ -3 & -4 \end{bmatrix}
\begin{bmatrix} 1 & 2 \\ 3 & 4 \end{bmatrix}
\begin{bmatrix} 4 & -2 \\ -3 & 1 \end{bmatrix}
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