help with fet constraint or trick

[fartoto_dz2004]

How do I ensure that a particular professor has at least two activities(same group or different) with/beside a specific activity (with a activity tag or a subject name) ?
more explanation:
i have a teacher who have 3 groups with same subject but he have a 4th group with another quarterly subjet  i want to ensure that the teacher won't have 1 activity in a day when he finished the quarterly subjet
thanks

[Liviu Lalescu]

Duplicate post. See continuation here: https://lalescu.ro/liviu/fet/forum/index.php?topic=5355.0