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$\text{A, B, C}$ are three numbers. Let $@ \text{(A, B)} =$ average of $\text{A}$ and $\text{B}$, $/ \text{(A, B)} = $ product of $\text{A}$ and $\text{B}$ ... )$X(@\text{(A, B)}, 2)$@(/\text{(A, B)}, 2)$@(X\text{(A, B)}, 2)$