For words that only have three letters, there is not any 4th letter. By way of example with the word “increase”, there are no far more letters Later on and thus should be the word "increase". The word “addict” is from the BIP39 wordlist however you would have employed “addi” http://josueaqpi312.huicopper.com/from-words-to-riches-just-how-to-successfully-make-use-of-bip39-passphrases-for-your-copyright-budgets