Bip39 seed to mnemonic https://www.hometalk.com/member/176312665/elva1377050 3a43fced052690635cc9fdce418514528b000dff3eaa5b986ea7be809062e775f2fe99c76733ff200b56fb70cac7c6ac7818b1e8139192a70fe274f5bf57fa46 For words that only have 3 letters, there isn't any 4th letter. By way of example Using the word “include”, there are no much more letters afterwards and thus needs to be the word "... https://bookmarkcitizen.com/story20068886/bip39-rust-crate-bip39-checksum-an-overview-https-cutt-ly-uryc5rw7