[Haskell-beginners] Type classes and synonyms

[John Dorsey]

Daniel Fischer re-nitpicked:
> 
> I don't see
> 
> second f (d,b) = (undefined, f undefined)
> second f (d,b) = (d, f undefined)
> 
> in there.

Brilliant!  I thought I might have missed something, hence "I count seven"
instead of "there are seven".

John