I took the index in the words, converted the variety to binary, extra 3 zeros, calculated the sha256 digest, took the 1st Element of the hexadecimal to transform it to binary, added three zeros towards the 8 digits on the binary and got 00000010011 which translates to 19 in decimal. https://dirstop.com/story21955954/helping-the-others-realize-the-advantages-of-bip39-mnemonic-phrase-tool