Re: [Haskell-cafe] Re: Tree Guidance

[snip] Thanks, Apfelmus, for the references. Guess I'll start there, then. And thanks, Chris, for the info and code. Read only 'up pointers' could be what is needed. But before going on, I want first to get more confortable with programming with trees. It's all very well to say they're easy to roll, but lists are even simpler, and look at them... Regards, Hans