Replicate each element of a row vector (with NaN) a constant number of times.
n=2, A=[1 2 3] -> [1 1 2 2 3 3]
n=0, A=[2 1] -> 
Remove the two elements next to NaN value
Check if number exists in vector
Doubling elements in a vector
Add two numbers
Find my secret number
BLOCK x3 (Version 4)
I want to know everything!
Mysterious digits operation (easy)
Permute diagonal and antidiagonal
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