I uploaded a new article "Listing Recurring Polygrams from Ciphertext (with Perl)". It presents a script in Perl to list recurring polygrams from a ciphertext (or any text). Here, I define a polygram to be an n-gram where n>=LEN (e.g., 10).
Although tools for counting bigrams etc. are available, I couldn't find tools for listing recurring long n-grams. So, I wrote one myself. It has known limitations, but it serves for my immediate need.
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