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        | A hollow or solid object shaped like a tube or pipe. |  | 
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        | A standard or scale of measurement. |  | 
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        | A closed path through which an electric currentflows or may flow. |  | 
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        | A promise or assurance, such as one given by a manufactureras to the equality or durability of a product. |  | 
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        | To clean with a vacuum cleaner. The absence of matter.
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        | A person“s means of support; a living. |  | 
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        | A source of inconvenience; a bother. |  | 
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        | Preceding in time or order. |  | 
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        | Something that follows from an action or condition; an effect; a result. |  | 
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        | The usually movable organ in the floor of the mouth in humans and most vertebrates, functioning in eating, in tasting, and, in humans, in speaking. |  | 
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        | A chronic disease that is often allergy-related. |  | 
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        | A turtle, spacially one that lives on land. |  | 
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        | A small, flaky cake of bread leavened with baking powder or soda. |  | 
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        | Light grayish or yellowish brown. |  | 
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        | A person of great learning. |  | 
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        | Organized activity to attain some political, social, or commercial goal. |  | 
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        | A large branch of a tree. |  | 
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        | A male ruler of an empire. |  | 
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        | A sweet, many-seededberry that grows on pickly plant with long, woody stems. |  | 
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