not saved

I started out so well - nearly 5,000 words in 2 days I was on a roll and then...tragedy. I thought I hit the save button and closed the computer for updating, came back and nothing - it was all gone. I'm so not happy with myself right now, but I've been plugging away all day and have managed to recreate and retype all of it if only slightly altered - so of a rewrite in my head.
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