Guess the formula to transform strings as follows:
'Hello World!' --> 'Ifmmp Xpsme!'
'Can I help you?' --> 'Dbo J ifmq zpv?'
Simple and interesting.
Remove all the words that end with "ain"
Distance walked 2D
Right and wrong
Reverse the vector
Pernicious Anniversary Problem
Handle to an array of functions
Replace multiples of 5 with NaN
Count up then down
Raise Matrix to Power
Create an 'arrow-head" matrix
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