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Two trains are traveling towards each other on parallel tracks that run diagonally Northeast to Southwest and vice versa. train A (proper length L) travels southwest to northeast and train B (proper length 2L) travels northeast to southwest. Each moves at speed c/5 with respect to the ground. Draw a Minkowski diagram, using perpendicular axes for A's frame of reference, then draw in B's axes, labeling where the fronts and backs coincide.

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