For words that only have 3 letters, there isn't any 4th letter. Such as with the word “include”, there are no far more letters afterwards and therefore must be the word "insert". The word “addict” is during the BIP39 wordlist but you would've employed “addi” for “addict”. In case you https://monobookmarks.com/story18736540/helping-the-others-realize-the-advantages-of-bip39-mnemonic-phrase-tool