Bip39 mnemonic to private key http://www.mediafire.com/file/uilrjfajg2ami24/pdf-14673-57158.pdf Then again on average It will get 50 percent the time given in the tables underneath for an attacker to acquire the correct passphrase For words that have only 3 letters, there is not any 4th letter. By way of example Using the word https://sites2000.com/story10236994/bip39-docs-a-secret-weapon-for-bip39-mnemonic-https-linktr-ee-bip39