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If A1=[(0, 0, 0, 1), (0, 0, 1, 0), (0, 1...

If `A_1=[(0, 0, 0, 1), (0, 0, 1, 0), (0, 1, 0, 0), (1, 0, 0, 0)],A_2=[(0, 0, 0,i),(0, 0,-i, 0), (0,i,0, 0),(-i,0, 0, 0)],t h e nA_i A_k+A_k A_i` is equal to
a. `2Iifi=k`
b. `Oifi!=k`
c. `2lifi!=k`
d. `O` always

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