For words that only have three letters, there is absolutely no 4th letter. For instance with the word “insert”, there won't be any extra letters Later on and therefore must be the word "add". The word “addict” is while in the BIP39 wordlist however, you would have utilised “addi” for https://friendlybookmark.com/story18806935/5-simple-techniques-for-bip39-seed-phrase