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But as Ward Cunningham puts it, this understanding is in my head—a notoriously volatile form of storage. I need to persist it by moving it from my head back into the code itself. (Location 533)

The great benefit of removing local variables is that it makes it much easier to do extractions, since there is less local scope to deal with. Indeed, usually I’ll take out local variables before I do any extractions. (Location 698)