For words that only have three letters, there isn't a 4th letter. One example is with the word “insert”, there isn't any additional letters Later on and so have to be the word "incorporate". The word “addict” is inside the BIP39 wordlist however , you would have utilized “addi” for https://mysterybookmarks.com/story19112198/how-much-you-need-to-expect-you-ll-pay-for-a-good-bip39-definition