Student can have max 3 gaps per day
1. First you need to allow discontinout layout so that the software can create the gaps. By default the software will not create any gap.
2. Then you just need to add cardrelationship "Max gaps per day":
this function works best in the PRO version, because if the software can move the student between parallel sections of the same subject, its easier to fulfill this condition. In standard version the software moves only the cards around with students fixed to their sections.