Thanks, Artie and thanks to Dr Richards! I figured it out. I was not correlating the Exprs properly. Now that I broke it up into Lit1 and Lit2 and am returning a Lit1 or a Lit2 which will return an Expr, it works! :) Pratik -------------------------------- Pratik Bhadra Undergraduate Section Leader The University of Texas at Austin College of Natural Sciences Junior BS Computer Sciences ---------------------------------