For words that only have three letters, there is no 4th letter. For example with the word “include”, there won't be any far more letters afterwards and thus must be the word "incorporate". The word “addict” is inside the BIP39 wordlist but you might have employed “addi” for “addict”. Unlock https://pr6bookmark.com/story19145885/new-step-by-step-map-for-bip39-english-words