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?
Tell me the slope
Set a diagonal
Determine if input is a perfect number
The sliding puzzle: 15
Sorting integers by their digits (Level 3)
Sorting integers by their digits (Level 4)
Mean number of letters per word (Easy)
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