For words that have only three letters, there is no 4th letter. Such as with the word “include”, there isn't any a lot more letters Later on and thus need to be the word "insert". The word “addict” is inside the BIP39 wordlist however , you might have utilised “addi” https://brightbookmarks.com/story19017549/detailed-notes-on-copyright-wallet-seed-phrase-out-of-bip39