1st period     9:55 — 10:50 (5 minutes for announcements)
2nd period    10:55 — 11:45
1st lunch      11:45 — 12:10
3rd period    12:15 — 1:05
3rd period    11:50 — 12:40
2nd lunch     12:40 — 1:05
4th period    1:10 —  2:00
5th period    2:05 —  2:55
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