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Substitution cipher

method of encoding by which units of plaintext are replaced with ciphertext, according to a fixed system; the "units" may be single letters (the most common), pairs of letters, triplets of letters, mixtures of the above, and so forth

Pronunciation
/sʌbstɪˈtjuːʃn ˈsʌɪfə/
/ˌsəbstɪˈtjuʃən ˈsaɪfər/
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