**Packages**

The sort function implements a stable sorting algorithm. It is
a special case of sortBy, which allows the programmer to supply
their own comparison function.
Elements are arranged from lowest to highest, keeping duplicates in
the order they appeared in the input.

>>> sort [1,6,4,3,2,5] [1,2,3,4,5,6]

cycle ties a finite list into a circular one, or equivalently,
the infinite repetition of the original list. It is the identity on
infinite lists.