Bip39 regex https://mariobrpx591.cavandoragh.org/getting-a-bip39-phrase-in-python-a-comprehensive-tutorial 3a43fced052690635cc9fdce418514528b000dff3eaa5b986ea7be809062e775f2fe99c76733ff200b56fb70cac7c6ac7818b1e8139192a70fe274f5bf57fa46 For words that have only 3 letters, there is not any 4th letter. As an example with the word “include”, there won't be any much more letters afterwards... https://thejillist.com/story10852114/bip39-docs-not-known-details-about-bip39-word-list-txt-https-cutt-ly-uryc5rw7