Department of Computer Science, Utah State University, Logan, Utah 84322-4205, USA. jgillespie@cc.usu.edu|Department of Computer Science, Utah State University, Logan, Utah 84322-4205, USA. jgillespie@cc.usu.edu|Department of Computer Science, Utah State University, Logan, Utah 84322-4205, USA. jgillespie@cc.usu.edu