For words that only have 3 letters, there isn't any 4th letter. One example is with the word “insert”, there aren't any additional letters Later on and therefore should be the word "insert". The word “addict” is in the BIP39 wordlist but you might have utilized “addi” for “addict”. Art https://maroonbookmarks.com/story18933809/examine-this-report-on-bip39-passphrase