I took the index from the words, converted the amount to binary, additional three zeros, calculated the sha256 digest, took the main A part of the hexadecimal to convert it to binary, extra a few zeros to your eight digits with the binary and received 00000010011 which translates to 19 https://franciscougju442.bravesites.com/entries/general/Opening-the-Power-of-BIP39-An-Extensive-Consider-Word-Lists-and-Secure-Budgets