Create a reverse checkbox matrix with '69'.
Where the size is the input and output will be a square checkbox matrix.
If input is 4 then output will be
[ 0 69 0 69
69 0 69 0
0 69 0 69
69 0 69 0]
Back to basics 22 - Rotate a matrix
Determine Whether an array is empty
Number of Horns on a unicorn!
kmph to mps
ZigZag matrix with reflected format
~~~~~~~ WAVE ~~~~~~~~~
factor to number
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