For words that only have 3 letters, there isn't a 4th letter. By way of example with the word “incorporate”, there are no extra letters Later on and therefore has to be the word "insert". The word “addict” is while in the BIP39 wordlist however , you might have employed https://socialskates.com/story20176247/detailed-notes-on-copyright-wallet-seed-phrase-out-of-bip39