| Author information
 Palle E. T.  Jorgensen: 
Department of Mathematics 
University of Iowa  
Iowa City, IA 52242, USA 
palle-jorgensen@uiowa.edu 
 Daniel Markiewicz: 
Department of Mathematics 
Ben-Gurion University of the Negev  
P.O.B. 653, Be'er Sheva 8410501, Israel 
danielm@math.bgu.ac.il 
 Paul S. Muhly: 
Department of Mathematics 
University of Iowa  
Iowa City, IA 52242, USA 
paul-muhly@uiowa.edu 
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