Bip39 Checksum. Since the 24th is usually a checksum word, a list of eight legitimate candidate words are calculated utilizing the Python script 24thword.py. For words that only have three letters, there is no 4th letter. For instance with the word “insert”, there aren't any more letters Later on and https://directoryhand.com/listings13150712/bip39-mnemonic-generator-https-linktr-ee-bip39-bip39-words-an-overview