Not really my solution... just a slightly cheating version of @bmtran's.
Which values occur exactly three times?
Unique values without using UNIQUE function
Generate a NaN...on purpose
Fibonacci-Sum of Squares
Make roundn function
Back to basics 25 - Valid variable names
Back to basics 4 - Search Path
Back to basics 15 - Benchmark
Number of toolboxes?
Back to basics 21 - Matrix replicating
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