I took the index with the words, converted the number to binary, added three zeros, calculated the sha256 digest, took the initial Section of the hexadecimal to transform it to binary, additional 3 zeros for the 8 digits on the binary and acquired 00000010011 which translates to 19 in decimal. https://bookmarkpagerank.com/story18833308/the-basic-principles-of-bip39-passphrase-generator