Department of Computer Science, University of Western Ontario, London, ON, Canada. rkaramic@uwo.ca.|Department of Computer Science, University of Western Ontario, London, ON, Canada. lila.kari@uwo.ca.|Department of Mathematics and Computing Science, Saint Marys University, Halifax, NS, Canada. s.konstantinidis@smu.ca.|Department of Computer Science, University of Western Ontario, London, ON, Canada. steffen@csd.uwo.ca.