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I'm pretty sure this is the correct answer and I'm assuming the failure is due to numerical precision on the solver. Perhaps there should be a looser tolerance when checking?
My failing solution size is 35, with the leading solution size at 30. @ Doug, were you able to get a solution, without using a function block to manipulate the output?
Make one big string out of two smaller strings
Return unique values without sorting
Reverse the elements of an array
Equal to their cube
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