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If (x(1),y(1),z(1)),(x(2),y(2),z(2)),(x(...

If `(x_(1),y_(1),z_(1)),(x_(2),y_(2),z_(2)),(x_(3),y_(3),z_(3))` and `(x_(4),y_(4),z_(4))` be the consecutive vertices of a parallelogram show tat `x_(1)+x_(3)=x_(2)+x_(4),y_(1)+y_(3)=y_(2)+y_(4)` and `z_(1)+z_(3)=z_(2)+z_(4)`.

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