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Reply To: The official Challenge 10 tips and hints thread


Back in October, when the slip of paper was released, I checked, and yes, it is an invertible matrix.
That makes it useful as a 3×3 Hill key. You may do as you wish with this information. But if it leads
nowhere, don’t get mad at me.

[How could we ever get mad at you? Harry

PS: Oh, I see. Yes, that could make us a bit mad. OK.]

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