Show that the points `A(,1,2,3),B(-1,-2,-1),C(2,3,2) and D(4,7,6)` are the vertices of a

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Show that the points `A(,1,2,3),B(-1,-2,-1),C(2,3,2) and D(4,7,6)` are the vertices of a parallelogram ABCD but it is not a rectangle.
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