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.
Return the 3n+1 sequence for n
Number of 1s in the Binary Representation of a Number
Project Euler: Problem 1, Multiples of 3 and 5
Maximum value in a matrix
Spherical surface triangulation
Knights and Knaves (part 1)
One track five lanes
Fastest shortest-path-finder in the west
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