I took the index with the words, converted the quantity to binary, extra three zeros, calculated the sha256 digest, took the main Portion of the hexadecimal to convert it to binary, additional a few zeros towards the eight digits from the binary and got 00000010011 which translates to 19 in https://210list.com/story20079336/helping-the-others-realize-the-advantages-of-bip39-mnemonic-phrase-tool