Superb job of not giving away answers in the test suite.
The solutions for x<-1 would require y^2<0.
William, expand the right side.
Volume of a Parallelepiped
Replicate elements in vectors
Replace multiples of 5 with NaN
Recaman Sequence - II
Determine whether a square can be drawn on a grid of dots
Identify Ruth-Aaron numbers
Compute Khinchin's constant
Pass the cards in Fitch Cheney's five-card trick
Label primes with the Erdos-Selfridge classification
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