It's seems that even if we consider that the fly is always colliding with the same train (instead of zig-zagging between trains), the results are always the same.
Next Higher Power of B
Find a Pythagorean triple
Knights and Knaves (part 1)
Clockwise or Counterclockwise
One track five lanes
Free passes for everyone!
singularity 2.0 (really hard)
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