[Haskell-cafe] A question about "An introduction to Category theory in four easy movements"

Hi all, I was thinking about reading "An introduction to Category theory in four easy movements" available online at http://www.cs.man.ac.uk/~hsimmons/BOOKS/books.html I noticed however that these notes were published as a book. Looking at the table of contents at Amazon, it seems that organization of material is different. About 40% of online version are solutions to the exercises and this is seems not to be the case for the book. Were these solutions removed from the printed version or are they just contained within chapters? Are there any significant differences in scopes of these two versions? I would be thankful if anyone owning the book could give a short comparison with online notes. Janek