| 11. | Kiefer has been showcasing his talent this year thanks to a lengthy injury-free period.
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| 12. | The stimulus-free period is called the " trace interval ".
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| 13. | Since World War II, Cambodia has enjoyed few strife-free periods.
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| 14. | The annual frost-free period lasts from 260 to 280 days.
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| 15. | The average relative humidity is 70 %, and the frost-free period is 140 days.
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| 16. | The duration of frost-free period is 180 days the longest in North Korea.
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| 17. | These placements take place during evenings, weekends and free periods.
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| 18. | For four days, many took advantage of the toll-free period to cross the bridge.
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| 19. | Students are not obligated to stay on campus during lunch time and free periods.
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| 20. | "This is why progression-free survival, or the disease-free period, was the trial's primary endpoint.
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