I took the index on the words, converted the number to binary, extra three zeros, calculated the sha256 digest, took the first Element of the hexadecimal to transform it to binary, added 3 zeros to your eight digits on the binary and received 00000010011 which interprets to 19 in decimal. https://bookmarkingdelta.com/story18794277/examine-this-report-on-bip39-passphrase