For words that have only three letters, there is no 4th letter. For example with the word “incorporate”, there isn't any a lot more letters Later on and therefore need to be the word "increase". The word “addict” is in the BIP39 wordlist however, you might have utilised “addi” for https://socialbaskets.com/story4367336/not-known-facts-about-bip39-english-words