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Thank you so much. Not necesarily same time. I just want the activities not to be on the same day.

Good day

Which constraint can I use if there is a teacher that is sharing a combination of subjects and that must be on the same day.

Example: Ronald teaches Biology, Rodwell teaches IT Practical and Roland teach IT Theory

Biology/IT Practical (3 Periods) is taught at the same time
Biology/IT Theory (2 Periods) is taught at the same time
These students are the same.
Which constraint must l use for these subjects not to be on the same day. Meaning all the 5 are on different days. Monday to Friday.

Thanks for helping