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]
Which doors are open?
The Goldbach Conjecture, Part 2
Whether the input is vector?
Insert zeros into vector
Diagonal & Anti-Diagonal Matrix: Easy
BULLSEYE Part 3: Reference Problem 18 BULLSEYE
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