| 21. | Laser therapy has been used to shrink and stiffen retraction pockets.
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| 22. | This tape reduces canopy oscillations and stiffens the wing in flight.
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| 23. | The change offers flexibility, but continues to stiffen requirements.
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| 24. | Now fresh legislation is being debated in Parliament to stiffen criminal penalties.
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| 25. | The arteries begin to stiffen, and oxygen is transported less efficiently.
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| 26. | But in fact, in many cases it tends to stiffen resolve.
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| 27. | _Stiffen penalties for adults who sell or give handguns to juveniles.
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| 28. | When you feel inadequate, you tend to stiffen up,
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| 29. | I stiffen up, sweat and get goose-bumps.
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| 30. | His legs stiffen and stray; his basic navigational instincts betray him.
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