> Here's the file. I just followed links from the ICFP page. Hmm. That's not the problem. I was using the same one. Here's the error I'm seeing. Any ideas? This is TeX, Version 3.14159 (Web2C 7.3.1) (contify.tex LaTeX2e <1998/12/01> patch level 1 ... ! Missing { inserted. <to be read again> \mathchoice l.268 & \Aone {} & \Atwo{} \\