For words that only have three letters, there isn't any 4th letter. For example with the word “insert”, there aren't any additional letters Later on and therefore need to be the word "increase". The word “addict” is while in the BIP39 wordlist however , you would have applied “addi” for http://remingtonjszi611.almoheet-travel.com/from-words-to-wide-range-how-to-efficiently-use-bip39-passphrases-for-your-copyright-wallets