More Friendship

On the grounds that you shouldn't criticize something if you're not prepared to do something about it, I wrote up my own version of the proof of the Friendship Theorem. There is nothing new here -- the ideas are the same as in the other notes, just the presentation differs. You can guess which one I prefer! I've also included some internal comments which might be useful in thinking about how to attack problems in this area. Please let me know (good or bad!) what you think of it.