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The children cannot finish after 8th period, there is no bus after period 8 on our school...
Question: the children cannot finish the school after 8th period. The have to finish either after 7th or 9th.
Now you have entered constraint that when there is a lesson on period 8, there must be also lesson on period 9 (because there must be at least two periods on 8-9, or 8-9 must be empty). So children can't finish on period 8, they have to stay till end of period 9.
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