4x4 Matrix with Entries -1, 0, 1, and 2

This is a 4x4 matrix with entries -1, 0, 1, and 2.

[ [ 2, -1, 1, -1 ], [ -1, -1, -1, 0 ], [ -1, 0, 3, -1 ], [ -1, -1, -1, 2 ] ]

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