Homepage: https://www.gnu.org/software/emacs
Author: Lars Magne Ingebrigtsen
Range functions
A "range" is a list that represents a list of integers. A range is a list containing cons cells of start/end pairs, as well as integers. ((2 . 5) 9 (11 . 13)) represents the list (2 3 4 5 9 11 12 13).