For words that only have three letters, there's no 4th letter. One example is with the word “insert”, there won't be any additional letters afterwards and so need to be the word "include". The word “addict” is in the BIP39 wordlist however you would've utilised “addi” for “addict”. This additional https://socialmphl.com/story20867671/examine-this-report-on-bip39-passphrase