Question: Four points A, B, C, and D are defined in a 3-dimensional coordinate system at (1, 1, 3), (9, - 1, - 2), (11, 2,

Four points A, B, C, and D are defined in a

Four points A, B, C, and D are defined in a 3-dimensional coordinate system at (1, 1, 3), (9, - 1, - 2), (11, 2, - 9), and (3, 4, -4) respectively. There are six straight line segments each of which is the straight line joining up two of the four points. Find all pairs of parallel lines among these six straight line segments

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