>>> What is the Texas Longhorn's head coach Steve Sarkisian's nickname? 

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The response "Sark" is a reasonable guess for Steve Sarkisian's nickname, given that it is a shortened version of his full name. However, without more context about how this nickname is used or if it is officially recognized by the university, it is not possible to definitively state that "Sark" is Steve Sarkisian's nickname with absolute certainty.