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If you are referring to "the Combine", it is a interdimensional "empire" composed of various alien species. It is common belief that The Combine are ruled by the "grub-like" Advisors (see Combine and Combine Advisor). A combine is also a machine used to harvest grains and other crops, and, in a way, are similar to the Combine empire. - Koye @ 18:58, May 6, 2011 (UTC)

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