Write a function that when given an odd number, produces an arrow-head function pointing to the right.
n = 3
n = 5
[ 1 0 0
0 1 0
0 0 1
1 0 0]
random picture with random colours
Back to basics 19 - character types
Detect a number and replace with two NaN's
Do Fast Fourier Transformation
Raise Matrix to Power
Handle to an array of functions
Replace multiples of 5 with NaN
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