For words that have only 3 letters, there is no 4th letter. For instance with the word “include”, there are no extra letters Later on and thus must be the word "insert". The word “addict” is during the BIP39 wordlist however, you would've used “addi” for “addict”. You signed in https://meshbookmarks.com/story18880180/helping-the-others-realize-the-advantages-of-bip39-mnemonic-phrase-tool