This was a fun problem, but I think lookup table solutions are possible given the way the way the test suite is configured. Maybe you could add a string parser to see if the test suite correct solutions are included in the answer code?
Make a random, non-repeating vector.
Replace multiples of 5 with NaN
The sliding puzzle: 15
Return the sequence element II
Sorting integers by their digits (Level 3)
Mean number of letters per word (Hard)
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