**FILE** Lee Medina, an employee at Dan D Party Corner in Cheyenne, Wyo., stands near a close-to-empty helium tank used to fill balloons on Sept. 22, 2011. (Associated Press)
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**FILE** Lee Medina, an employee at Dan D Party Corner in Cheyenne, Wyo., stands near a close-to-empty helium tank used to fill balloons on Sept. 22, 2011. (Associated Press)
