For words that only have three letters, there isn't a 4th letter. Such as with the word “insert”, there isn't any a lot more letters Later on and therefore need to be the word "insert". The word “addict” is from the BIP39 wordlist however , you would have utilized “addi” https://mixbookmark.com/story4382072/examine-this-report-on-bip39-passphrase