Bip39 Checksum. At the start you ought to shop it SEPARATELY from a seed. Obtaining your seed along with your passphrase in exactly the same spot defeats the goal of possessing a passphrase to start with. BIP39 specifies a list of 2048 words from which the mnemonic phrase is picked https://pr8bookmarks.com/story18861089/bip39-word-list-pdf-https-linktr-ee-bip39-top-guidelines-of-bip39-mnemonic