Bip39 One. The sole purpose All those letters are listed is to make it much easier for our human brains to study them and possibly memorize our recovery phrase. Sharing your seed's locale with some other person rather than worrying about them with the ability to just take your cash. https://finance-meaning27261.wikifrontier.com/7780207/the_anatomy_of_the_bip39_phrase_entropy_words_and_stability