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.
Replace NaNs with the number that appears to its left in the row.
Prime factor digits
Indexed Probability Table
Project Euler: Problem 6, Natural numbers, squares and sums.
Sum the Digits of a Number
Knights and Knaves (part 3)
Knights and Knaves (part 1)
singularity 2.0 (easier)
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