I took the index in the words, transformed the number to binary, added a few zeros, calculated the sha256 digest, took the initial Portion of the hexadecimal to convert it to binary, additional a few zeros for the eight digits with the binary and obtained 00000010011 which translates to 19 https://thegreatbookmark.com/story18846221/helping-the-others-realize-the-advantages-of-bip39-seed-phrase-mnemonics-generator