Bip39 last word checksum https://collinmmss433.lucialpiazzale.com/from-concept-to-fact-generating-bitcoin-addresses-with-bip39 3a43fced052690635cc9fdce418514528b000dff3eaa5b986ea7be809062e775f2fe99c76733ff200b56fb70cac7c6ac7818b1e8139192a70fe274f5bf57fa46 For words that only have 3 letters, there's no 4th letter. One example is With all the word “include”, there won't be any a lot mor... https://xyzbookmarks.com/story19973313/bip39-word-list-excel-bip39-github-an-overview-https-dzen-ru-bip39-phrase-com