I took the index of the words, converted the number to binary, included three zeros, calculated the sha256 digest, took the very first Component of the hexadecimal to convert it to binary, added 3 zeros on the eight digits from the binary and obtained 00000010011 which translates to 19 in https://7bookmarks.com/story18711356/helping-the-others-realize-the-advantages-of-bip39-mnemonic-phrase-tool