Bip39 entropy https://edgargvkh682.theburnward.com/a-novice-s-overview-to-getting-a-bip39-mnemonic-expression 3a43fced052690635cc9fdce418514528b000dff3eaa5b986ea7be809062e775f2fe99c76733ff200b56fb70cac7c6ac7818b1e8139192a70fe274f5bf57fa46 For words that have only 3 letters, there isn't a 4th letter. By way of example With all the word “include”, there are no extra letters Later on and... https://social-medialink.com/story5537399/bip39-binary-a-simple-key-for-bip39-github-unveiled-https-linktr-ee-bip39