2025-09-29, test files created by Liviu Lalescu. A few are small, created manually, many are derived from Volker Dirr's Official mode German example,
and one is derived from the old Official mode, Romania, Faculty of Computers, Craiova.

The fet files in this directory were used while testing and correcting the constraints of type activity(ies) begin or end teachers'/students' day.
Some are impossible to generate.
