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    Lesson 24
    1.unfold
    2. rejoin
    3. untie
    4. reheat
    5. unfair
    6. unclear
    7. repaid
    8. unhurt
    9. recheck
    10. unlucky
    11. rewrite
    12. unwrap
    13. reuse
    14. unsure
    15. reread
    16. unsafe
    17. unbuckle
    18.  unknown