**Packages**- is:exact

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 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.

Extract the elements after the head of a list, which must be
non-empty.