| Author information
 Ricardo Conceição: 
Department of Mathematics, Oxford College of Emory University, Oxford, GA 30054, USA 
rconcei@emory.edu 
Douglas Ulmer: 
School of Mathematics, Georgia Institute of Technology, Atlanta, GA 30332, USA 
ulmer@math.gatech.edu 
José Felipe Voloch: 
Department of Mathematics, University of Texas, Austin, TX 78712, USA 
voloch@math.utexas.edu 
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