Guess the formula to transform strings as follows:
'Hello World!' --> 'Ifmmp Xpsme!'
'Can I help you?' --> 'Dbo J ifmq zpv?'
Simple and interesting.
Which values occur exactly three times?
Rotate a Matrix by 90 degrees
Sophie Germain prime
Make a Star Pyramid
Raise Matrix to Power
Create an 'arrow-head" matrix
Count up then down
Two-output anonymous function?
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