length!! and not "not isempty"... good point!
radius of a spherical planet
Multiply 2 numbers
Doubling elements in a vector
05 - Vector Equations 1
How many monitors are connected ?
Numbers spiral diagonals (Part 2)
Find my secret number
Mirror, mirror on the wall, who is fairest of them all?
Decrypt the cypher using XOR encryption (for beginners)
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