For words that only have three letters, there is not any 4th letter. For instance with the word “include”, there are no far more letters Later on and so needs to be the word "include". The word “addict” is within the BIP39 wordlist however you would have utilised “addi” for https://socialstrategie.com/story4551859/a-secret-weapon-for-bip39-words-to-numbers