Department of Mathematics and Statistics, Utah State University, Logan, UT 84322, USA. john.r.stevens@usu.edu|Department of Mathematics and Statistics, Utah State University, Logan, UT 84322, USA. john.r.stevens@usu.edu|Department of Mathematics and Statistics, Utah State University, Logan, UT 84322, USA. john.r.stevens@usu.edu|Department of Mathematics and Statistics, Utah State University, Logan, UT 84322, USA. john.r.stevens@usu.edu