Bip39n code https://rentry.co/p68weyby Checksum development: A checksum is created from this entropy using SHA-256 hashing, which aids verify the mnemonic's integrity afterwards. For words that have only 3 letters, there's no 4th letter. As an example With all the word “add”, there isn't any additional letters afterwards and thus have https://myfirstbookmark.com/story20068521/bip39-ethereum-wallet-about-bip39-2048-words-https-www-youtube-com-channel-ucupxfytj0fb78sq55hu6ocw