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1. A device or structure purposed to control the flow or passage of any of the three states of matter: solid, liquid or gas. Such structures may be found in plumbing, as well as in the human body (specifically, the heart). 2. A company in the game development industry that designed and continues to build upon the Half-Life series. Also, the brains (or lack thereof) behind the infamous "Steam" client, content-delivery platform.
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