I took the index of the words, transformed the number to binary, added 3 zeros, calculated the sha256 digest, took the main part of the hexadecimal to transform it to binary, included three zeros towards the 8 digits of the binary and got 00000010011 which interprets to 19 in decimal. https://franciscougju442.bravesites.com/entries/general/Opening-the-Power-of-BIP39-An-Extensive-Consider-Word-Lists-and-Secure-Budgets