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I hope my post is in the right section. I need some help with decoding a Playfair code.

I only have the ciphertext which is 22 lines long. What's the best way to do this? I red that I have to do some frequency analysis of the English bigrams which I did. There's one combination which has the highest frequency. I changed this combination by 'th', but now I have three combinations with the same frequency. How can I solve this problem?

(I'm working with matlab)

Is there a better way?

Many thanks,

Regards from Italy,

Impo