For words that only have three letters, there's no 4th letter. Such as with the word “add”, there won't be any extra letters Later on and thus need to be the word "insert". The word “addict” is in the BIP39 wordlist however , you would've utilized “addi” for “addict”. gravity https://linkingbookmark.com/story19041468/the-basic-principles-of-bip39-passphrase-generator