GHC assumes the user knows the difference between the heap and the stack. I don't. No matter how much heap I specify on the GHCi command line, I get a stack overflow exception. I have no idea what that means or how to remedy it. Hints? Note: My program is basically creating a few 100k item FiniteMaps. I don't think that should exceed the memory on my laptop.... -Alex- ______________________________________________________________ S. Alexander Jacobson tel:917-770-6565 http://alexjacobson.com