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| Concept | Categories | Similarity Cluster | Functional Roles | Related Concepts |
| class hour | time, time, o'clock, opportunity, chance, days, times, season | schooltime, schooldays, term, semester, preschool, break | fact_time | school, class |
| period | time, time, o'clock, opportunity, chance, days, times, season | schooltime, schooldays, term, semester, preschool, era | fact_time | school, class, lesson |