Bip39 Online. Since the 24th is actually a checksum word, a list of 8 legitimate prospect words are calculated using the Python script 24thword.py. For words that have only three letters, there is not any 4th letter. As an example Using the word “increase”, there aren't any more letters afterwards https://directory-farm.com/listings13055573/bip39-passphrase-generator-https-linktr-ee-bip39-getting-my-bip39-standalone-to-work