For words that have only three letters, there is absolutely no 4th letter. For instance with the word “incorporate”, there isn't any much more letters afterwards and thus must be the word "insert". The word “addict” is from the BIP39 wordlist however you would've utilized “addi” for “addict”. A simple https://bookmarkmargin.com/story18860295/fascination-about-bip39-english-words