Guess the formula to transform strings as follows:
'Hello World!' --> 'Ifmmp Xpsme!'
'Can I help you?' --> 'Dbo J ifmq zpv?'
Simple and interesting.
"Low : High - Low : High - Turn around " -- Create a subindices vector
Rotate input square matrix 90 degrees CCW without rot90
Flip the vector from right to left
Beginner's Problem - Squaring
Get ranks of values in a vector
Replace multiples of 5 with NaN
Create an 'arrow-head" matrix
Count up then down
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