Bip39 https://www.empowher.com/user/4550298 BIP85: A newer proposal letting the deterministic derivation of various BIP39 mnemonic seeds from a learn seed. For words that only have three letters, there is not any 4th letter. One example is Using the word “increase”, there isn't any more letters afterwards and so have to be https://bookmarklayer.com/story20175134/bip39-vs-slip39-reddit-new-step-by-step-map-for-bip39-github-https-linktr-ee-bip39