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?
Find relatively common elements in matrix rows
Increment a number, given its digits
Say something funny
The glass half full
Juggler sequence revisited
Sorting integers by their digits (Level 4)
Segmented number sequence
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