| 11. | He said the dust helps create a firm, level surface while the pebbles provide drainage.
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| 12. | This provided a level surface for mechanically changing the vehicle from rail to road wheels.
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| 13. | For example, a level surface in three-dimensional space is defined by an equation of the form.
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| 14. | The interior floor of Stefan is a generally level surface that is marked by several impacts.
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| 15. | Repeated beds will often be scratched to a nearly level surface, about two meters in diameter.
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| 16. | Water will run off a level surface.
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| 17. | Stock certificates were left for weeks piled haphazardly on any level surface, including filing cabinets and tables.
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| 18. | Shims are typically used in order to support, adjust for better fit, or provide a level surface.
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| 19. | _Place the grill on a level surface.
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| 20. | The interior floor of this crater forms a relatively level surface that is marked by several small craterlets.
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