'a' is a vector that starts at the origin and ends at (x, y). Find |a|.
Hint: It is as simple as "ABC".
More test cases, please! ;-)
Project Euler: Problem 7, Nth prime
Generate a vector like 1,2,2,3,3,3,4,4,4,4
Generate a NaN...on purpose
find the roots of a quadratic equation
Tiling a matrix
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