A parallelogram in R^3 has vertices A(-1,1,2), B(1,-2,8) and C=(3,-1,2).

A parallelogram in R3R^3 has vertices A(1,1,2)A\left(-1,1,2\right), B(1,2,8)B\left(1,-2,8\right) and C=(3,1,2)C=\left(3,-1,2\right).
Determine the coordinates of the fourth vertex.
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