$\begin {array} {1 1} (1)\;(X_1+X_2-2X_3)/2 & \quad (2)\;X_1+X_2-X_3 \\ (3)\;X_1+X_2-2X_3 & \quad (4)\;(X_1+X_2-X_3)/2 \end {array}$

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