I took the index with the words, converted the amount to binary, additional three zeros, calculated the sha256 digest, took the initial Section of the hexadecimal to transform it to binary, added three zeros towards the eight digits on the binary and received 00000010011 which interprets to 19 in decimal. https://bookmark-group.com/story4393298/the-basic-principles-of-bip39-passphrase-generator