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I have a Playfair cipher text and I know a portion of the text (one world). How can I decode the cipher from here? Thanks.

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    $\begingroup$ This is, IMO, a perfect example of a useful duplicate question; the linked question does provide the answer, but there's no way you'd guess that from the title. Upvoted and voted to close. :) $\endgroup$ – Ilmari Karonen Apr 4 '16 at 12:27

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