[kerkeslager]

I guess my bigger complaint in this example is that there's a lot left out. What's in `symbols`? What is each `coord`? What does `neighbouringNumbers` do? What is this function trying to do?

I write Python a great deal for a living these days and the Python code isn't much clearer to me. In both the Python and Haskell examples I can tell what it's doing (except the opaque neighbouringNumbers)--I just can't tell why it's doing it.