I took the index in the words, converted the amount to binary, added three zeros, calculated the sha256 digest, took the main Section of the hexadecimal to convert it to binary, added a few zeros on the eight digits on the binary and received 00000010011 which translates to 19 in https://wavesocialmedia.com/story5231155/helping-the-others-realize-the-advantages-of-bip39-mnemonic-phrase-tool