First test case is invalid. Please fix it.
I have fixed it.
and the fourth...
It must be OK now!
Remove all the words that end with "ain"
Create a square matrix of multiples
Create a vector whose elements depend on the previous element
Create an n-by-n null matrix and fill with ones certain positions
unique with nan
Go back n times
Lunar Arithmetic (Multiplication)
Cryptography with A Square Matrix : Encoding
Repeat string n times - 3
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