This permut package is

Copyright (c) 2000-2018, by
         Adolfo Ballester-Bolinches <Adolfo.Ballester@uv.es>,
         Enric Cosme-Ll\'opez <Enric.Cosme@uv.es>, and
         Ramón Esteban-Romero <Ramon.Esteban@uv.es> or <resteban@mat.upv.es>.

It may be freely distributed under the terms of the GNU public license
(see GPL in this directory), version 2 or (at your option) any later
version.
