For words that have only 3 letters, there isn't any 4th letter. For instance with the word “add”, there are no a lot more letters Later on and therefore should be the word "insert". The word “addict” is inside the BIP39 wordlist however, you would've applied “addi” for “addict”. The https://trackbookmark.com/story20475817/fascination-about-bip39-english-words