I took the index in the words, transformed the quantity to binary, extra three zeros, calculated the sha256 digest, took the very first A part of the hexadecimal to transform it to binary, included three zeros to your 8 digits from the binary and got 00000010011 which translates to 19 https://ledbookmark.com/story5145589/examine-this-report-on-bip39-passphrase