For words that only have three letters, there isn't a 4th letter. By way of example with the word “include”, there won't be any extra letters afterwards and therefore should be the word "include". The word “addict” is within the BIP39 wordlist however , you might have utilised “addi” for https://allyourbookmarks.com/story18916144/new-step-by-step-map-for-bip39-english-words