Copyright 2020, tslil clingman

These programmes are free software: you can redistribute them
and/or modify them under the terms of the GNU General Public License
as published by the Free Software Foundation, either version 3 of the
License, or (at your option) any later version.

These programmes are distributed in the hope that they will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
General Public License for more details.

You should have received a copy of the GNU General Public License
along with these programmes. If not, see
<https://www.gnu.org/licenses/>.