| 21. | Later a three-week toll-free period was announced by the operators.
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| 22. | Students are allowed to sign out of the building during lunch and free periods.
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| 23. | Frost-free period is long, which favors cereal crop production.
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| 24. | The frost-free period averages 270 days, and there are 1, 225 hours of sunshine annually.
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| 25. | A state House Democrat sponsored legislation that would create a four-day tax-free period next August.
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| 26. | He played the role of Brett in web released short films " Free Period ".
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| 27. | ESPN have offered a number of free periods, ranging between a weekend and a month.
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| 28. | During pain-free periods, he would dread the next attack.
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| 29. | The frost-free period lasts for 266 days on average.
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| 30. | Sharon said he had agreed on the violence-free period in his last trip to Washington.
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