Let us say there are train stations named A, B, C, D, and E. Here are the conditions:
The distance between A and B is 10 km,
the distance between B and C is 9 km,
the distance between C and D is 8 km,
and the distance between D and E is 13 km.
If the distance between A and E isn't 40 km, then how much is the distance?

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