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]
Is it a number?
07 - Common functions and indexing 5
length of a vector
Beginner's Problem - Squaring
BULLSEYE Part 3: Reference Problem 18 BULLSEYE
Diagonal & Anti-Diagonal Matrix: Easy
Put Two 1D matrices into one 1D matrix
COUNT VOWEL 2
BULLSEYE Part 2: Reference Problem 18 BULLSEYE
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