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For A=(3103)A=\begin{pmatrix}3&1\\0&3\end{pmatrix}, the vector e2=(0,1)e_2=(0,1) satisfies (A3I)e2=e10(A-3I)e_2=e_1\neq0 and (A3I)2e2=0(A-3I)^2e_2=0. What is its height?
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