For words that have only three letters, there's no 4th letter. One example is with the word “insert”, there won't be any additional letters afterwards and so have to be the word "add". The word “addict” is from the BIP39 wordlist however you would've utilized “addi” for “addict”. gravity trophy https://macrobookmarks.com/story18963214/an-unbiased-view-of-bip39-seed-phrase-github