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NullSpace[{{i, 1, 1, 0}, {-1, i, 0, 1}, {0, 0, i, 1}, {0, 0, -1, i}}]
NullSpace[{{i, 1, 1, 0}, {-1, i, 0, 1}, {0, 0, i, 1}, {0, 0, -1, i}}]
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