Look at this flow chart like diagram. It is a really nice representation for explaining the concepts of Iterators and Generators.
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By Vincent Driessen[/caption]
If you use git, then there is a big chance you might have come across this article A successful Git branching model by the same author. There are more pretty diagrams in that post as well. For a very long time I have wondered how those diagrams are made. I decided to find out today and it turns out it was done with: Keynote - the powerpoint equivalent in Mac.
Pretty good.