| 21. | It is a tough nut to crack ."
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| 22. | Any business that pays 40 percent of its gross revenues is a tough nut to swallow,
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| 23. | But Kalicharan is a tough nut to crack.
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| 24. | Offaly played almost to exhibition standard at times, although Clare proved a tough nut to crack.
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| 25. | This is a tough nut to crack.
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| 26. | "Let's face it _ that was a tough nut to crack, " an adviser to Clinton said.
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| 27. | Tikrit was a tough nut to crack.
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| 28. | The same qualities that make Rembrandt a towering artist also make him a tough nut for connoisseurs.
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| 29. | This place is just a tough nut.
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| 30. | That's a tough nut to crack for the likes of Red Bullet, Snuck In, and Hugh Hefner.
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