An Imgur user just couldn't wait to find out what was said in Sansa Stark's letter from "Game of Thrones" so they did a little investigating an this is what they came up with.
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From this angle you can makeout “to fufill”, “for Winterfell” and “rewarded.”
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This scene is where most of the message comes in.
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Flip it.
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Zoom in.
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*CSI voice* Enhance! “[…] to protect me. Now you have a chance to fulfill your promise. […] Knights of the Vale are under your command. Ride north for Winterfell. Lend us your aid and I shall see to it that you are [well/properly] rewarded.”