For words that have only 3 letters, there's no 4th letter. As an example with the word “add”, there isn't any extra letters afterwards and so has to be the word "include". The word “addict” is during the BIP39 wordlist but you might have utilized “addi” for “addict”. gravity trophy http://rylanmecp341.wpsuo.com/from-words-to-wide-range-exactly-how-to-efficiently-make-use-of-bip39-passphrases-for-your-copyright-pocketbooks