2020-09-11 Requested by saladv on https://lalescu.ro/liviu/fet/forum/index.php?topic=4657.0. Teachers cannot have both occupied 5th and 6th hours of any day. Gaps are not counted for teachers in the 5th and 6th if only one slot is free. If both slots are free, only one gap is counted. Breaks/not available are (or should be) treated correctly - as a non-gap.