The Tri-Valley Mustangs line up during the National Anthem before their last game of the season against the Vermillion Tanagers. The Mustangs finished their season with a 5-5 record. (Photo/Darlene McFarland) Matt Larson | Big Sioux Media The Tri-Valley Mustang football had their 2021 season come to an end in the quarterfinals on Thursday, October…

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