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Mathematical relative position
All the following should be on the same line'

Contrary and opposite:

(1) means that two people are at the same point, one is going east and the other is going west. Will not be satisfied.

(2) Two people are not at the same point, one is east and the other is west to both ends. Will not be satisfied.

Opposite and opposite: two people are not at the same point, one is east and the other is west to the middle. Will meet.

Same direction: two people are moving in the same direction at the same point.

Meeting: The above-mentioned "meeting" refers to

Chase:

(1) means that two people are moving in the same direction at the same point.

(2) Two people are not at the same point, but moving in the same direction.