Maths in first period

[lavert]

hi  In my school, we like, mathematics to be first, second  or third period every
from lavert

[Liviu Lalescu]

Add a constraint "a set of activities has a set of preferred time slots" (ConstraintActivitiesPreferredTimeSlots), subject=Mathematics, all teachers, all students, all activity tags, allowed = first three hours each day (add X in each day, hours four, five, etc.).

Or more constraints "a set of subactivities has a set of preferred time slots" (ConstraintSubactivitiesPreferredTimeSlots), and specify the components number.