For words that only have 3 letters, there is no 4th letter. Such as with the word “insert”, there won't be any a lot more letters Later on and thus must be the word "add". The word “addict” is while in the BIP39 wordlist but you would've applied “addi” for https://followbookmarks.com/story18922737/the-basic-principles-of-bip39-passphrase-generator