Bip39 split mnemonic https://squareblogs.net/edelinepge/using-python-to-produce-a-bip39-mnemonic-a-developers-point-of-view 3a43fced052690635cc9fdce418514528b000dff3eaa5b986ea7be809062e775f2fe99c76733ff200b56fb70cac7c6ac7818b1e8139192a70fe274f5bf57fa46 For words that only have three letters, there is not any 4th letter. As an example Using the word “insert”, there isn't any a lot more... https://modernbookmarks.com/story19797486/bip39-word-list-pdf-how-bip39-wallet-can-save-you-time-stress-and-money-https-x-com-tundra838554