For words that have only three letters, there isn't a 4th letter. As an example with the word “incorporate”, there aren't any a lot more letters Later on and therefore have to be the word "insert". The word “addict” is from the BIP39 wordlist however, you would've used “addi” for https://bookmarkproduct.com/story18897420/an-unbiased-view-of-bip39-seed-phrase-github