Upper triangular matrix/Generalized eigenspaces/1/Exercise

Determine the generalized eigenspaces of the matrix

${\begin{pmatrix}4&0&0&5&0&0\\0&1&3&0&6&0\\0&0&1&0&0&0\\0&0&0&5&2&7\\0&0&0&0&5&1\\0&0&0&0&0&5\end{pmatrix}}.$

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