Bip39 Python. The passphrase is just not chosen from the predefined list of 2048 words – it might be any word or phrase you select. BIP39 is a style implementation that lays out how copyright wallets create the set of words (or "mnemonic codes") which make up a mnemonic sentence, https://agency-social.com/story4036209/bip39-wallets-https-linktr-ee-bip39-an-unbiased-view-of-bip-39