For words that have only three letters, there is absolutely no 4th letter. Such as with the word “include”, there isn't any far more letters afterwards and thus need to be the word "increase". The word “addict” is from the BIP39 wordlist however you might have utilised “addi” for “addict”. https://privatebookmark.com/story19170183/detailed-notes-on-copyright-wallet-seed-phrase-out-of-bip39