Bip 39 github https://www.symbaloo.com/mix/bookmarks-xfkm BIP85: A more recent proposal letting the deterministic derivation of multiple BIP39 mnemonic seeds from a learn seed. For words that have only three letters, there is not any 4th letter. Such as Together with the word “add”, there isn't any much more letters Later on https://bookmarkinglife.com/story6141681/jade-bip39-passphrase-new-step-by-step-map-for-bip39-word-list-txt-https-x-com-tundra838554