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How does StackOverflow do its question revision history?

Someone corrected my post. I found the representation of both versions helpful.

What is the name of the concept? What does Stack Overflow use for it?

marked as duplicate by ChrisF, Martijn Pieters, Pops, jonsca, Brad Mace Sep 25 '12 at 14:25

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According to Jeff's 2009 blog post, he uses this algorithm and this implementation.

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