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?
middleAsColumn: Return all but first and last element as a column vector
Convert a vector into a number
Find out missing number from a vector of 9 elements
Increasing sub-sequence (Level 1)
The sliding puzzle: 3D
Number construction I
The glass half full
Factorizing a number into a given number of factors
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