For words that only have three letters, there is no 4th letter. Such as with the word “include”, there isn't any far more letters Later on and thus need to be the word "include". The word “addict” is in the BIP39 wordlist but you might have utilized “addi” for “addict”. https://health-lists.com/story19435587/5-simple-techniques-for-bip39-seed-phrase