For words that have only three letters, there's no 4th letter. For example with the word “incorporate”, there are no extra letters Later on and therefore have to be the word "increase". The word “addict” is from the BIP39 wordlist however you would've utilized “addi” for “addict”. In this manner, https://bookmarkingdelta.com/story18794436/the-ultimate-guide-to-bip39-seed-phrase-github