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When you look at it from that slant you can see they can never be caught no matter how fast the persuing plane goes they retreat at the same speed.

One good way to check that would be to have their plane to approach at the angles

The retreating effect could not cross in front of any of the plans it would have to go straight ahead.

you try and get the north pole of a magnet and south pole to connect and you will see what it mean.

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