Bip39 Standard. The passphrase is just not chosen within the predefined list of 2048 words – it might be any word or phrase you decide on. None of these examples are worried about arguments that you would probably use for differing types of typos, tokenlists, and so on. Your seed https://socialtechnet.com/story4246042/bip-39-https-linktr-ee-bip39-5-easy-facts-about-bip39-generator-described