Since Cody, I dislike for-loops, but your solution is way simpler than my own algorithm. Mission accomplished...
Nevertheless, I would hope for a non-looped piece of code. Let's see in phase 3.
Find best domino orientation
Detect a number and replace with two NaN's
Make a 1 hot vector
Find a Pythagorean triple
Extra safe primes
Order of things - 1
Order of things - 4
Bleed non-zeros to the right
Only once: cleaning up your columns
Wayfinding 3 - passed areas
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