I took the index on the words, converted the amount to binary, additional 3 zeros, calculated the sha256 digest, took the primary Component of the hexadecimal to convert it to binary, included 3 zeros towards the eight digits on the binary and obtained 00000010011 which translates to 19 in decimal. https://bookmarkzap.com/story18770853/the-basic-principles-of-bip39-passphrase-generator