So, my Puzzle 49 solution also works for Puzzle 50 (although here the circled bit can start in either position). In fact, I’m pretty sure that every Puzzle 49 solution also works for Puzzle 50.
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Yes, just runned it again and definitely works also for challenge 50 
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Yes, 49 and 50 have the same solution. I expected this to then also work for 51 to complete the loop to make the full paradox thematically, but I was disappointed to find that this was not the case