Bip39-Standalone. The passphrase is just not picked from the predefined list of 2048 words – it could be any word or phrase you choose. BIP39 specifies a list of 2048 words from which the mnemonic phrase is picked. Every word represents a variety in a binary sequence, plus the phrase https://social4geek.com/story4701640/bip39-word-list-https-linktr-ee-bip39-the-basic-principles-of-bip39-mnemonic