Bip39 word list how many words https://www.anime-planet.com/users/zoriuswxxq The final step of BIP-39 is producing the actual binary seed and that is then applied to be a master crucial in BIP-32 deterministic wallet or employing other techniques. For words that have only 3 letters, there is no 4th letter. One example https://1001bookmarks.com/story20352158/bip39-generator-online-bip39-npm-no-further-a-mystery-https-t-me-bip39-chat