Find values of h, k, l and m so that A 0, B 0, A

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Find values of h, k, l and m so that A ≠ 0, B ≠ 0, A2 = A, B2 = B and AB = 0, where

[11 1] A = h1 1 1 and 11 k B = -1 -l -1 -11 m m m m

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