Re: producing and consuming lists

Jorge,

But like I just showed, sometimes paring them may not be a natural approach though...

Yeah, I understand what you mean. In the examples you give, you could always try to make the appended stuff (the zs, etc) the same length by appending Nothings, but probalby not a general solution. I wonder if, given you original function which returns ([Int],[Int]), you couldn't do something really ugly like using unsafeInterleaveIO on writing the first list, and then write the second list "by hand". Just a thought. - Hal