For words that only have three letters, there isn't any 4th letter. As an example with the word “include”, there isn't any a lot more letters afterwards and so have to be the word "insert". The word “addict” is within the BIP39 wordlist however, you would have utilised “addi” for https://e-bookmarks.com/story5251107/considerations-to-know-about-bip39-seed-phrase-generator