For words that only have 3 letters, there's no 4th letter. One example is with the word “include”, there isn't any additional letters Later on and therefore must be the word "include". The word “addict” is from the BIP39 wordlist however you might have utilised “addi” for “addict”. - Lưu https://bookmarkworm.com/story18817728/the-2-minute-rule-for-bip39-all-words