Bip39 tool github https://pixabay.com/users/51089543/ Checksum development: A checksum is produced from this entropy working with SHA-256 hashing, which helps confirm the mnemonic's integrity later on. For words that only have three letters, there is no 4th letter. For instance With all the word “insert”, there aren't any much more letters https://wise-social.com/story6004888/bip39-full-list-the-definitive-guide-to-bip39-converter-https-linktr-ee-bip39