For words that have only three letters, there isn't a 4th letter. As an example with the word “include”, there are no additional letters afterwards and therefore should be the word "increase". The word “addict” is from the BIP39 wordlist but you might have employed “addi” for “addict”. A different https://geniusbookmarks.com/story18897050/considerations-to-know-about-bip39-word-list-pdf