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?
Test for balanced parentheses
Project Euler: Problem 4, Palindromic numbers
Sum the numbers on the main diagonal
Increasing sub-sequence (Level 2)
Return the sequence element II
Return the sequence element I
Number construction III
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