Not really my solution... just a slightly cheating version of @bmtran's.
Find the peak 3n+1 sequence value
Distance walked 2D
Create logical matrix with a specific row and column sums
Output any real number that is neither positive nor negative
Back to basics 7 - Equal NaNs
Back to basics 26 - Keywords
Back to basics 19 - character types
Back to basics 9 - Indexed References
Number of toolboxes?
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