Cryptogram key
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Each pair of letters in the “key” indicates a (possibly repeated) letter change. These changes encrypt the first part-word into the second. Each pair in the key must be used; any additional letters in the part-words are left unchanged. Example: oils; lolly, sissy. The key “oils” indicates o → i and l → s, changing “lolly” to “sissy”.
A phonetic cryptogram key works like a cryptogram key except that it uses phonemes rather than letters.
The cryptogram key was invented by Hale in 2015.