For words that have only 3 letters, there's no 4th letter. As an example with the word “include”, there are no extra letters Later on and thus must be the word "increase". The word “addict” is from the BIP39 wordlist however , you would have made use of “addi” for https://social4geek.com/story4601460/examine-this-report-on-bip39-passphrase