If A1=[0 0 0 1 0 0 1 0 0 1 0 0 1 0 0 0],...

If `A_1=[0 0 0 1 0 0 1 0 0 1 0 0 1 0 0 0],A_2=[0 0 0i0 0-i0 0i0 0-i0 0 0],t h e nA_i A_k+A_k A_i` is equal to `2lifi=k` b. `Oifi!=k` c. `2lifi!=k` d. `O` always

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