very cool question: learn some new tricks, and get 10 points, why not?!
Hint to spare the pain : string(NaN)==
Find relatively common elements in matrix rows
How long is the longest prime diagonal?
Number of Horns on a unicorn!
The Top 5 Primes
Fast 1-D Convolution (full shape)
String Array Basics, Part 1: Convert Cell Array to String Array; No Missing Values
String Array Basics, Part 4: Convert String Array with Missing Values to Cell Array
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