I took the index of the words, transformed the number to binary, extra three zeros, calculated the sha256 digest, took the 1st Element of the hexadecimal to transform it to binary, included three zeros for the 8 digits in the binary and received 00000010011 which translates to 19 in decimal. https://bookmark-search.com/story18772193/the-ultimate-guide-to-bip39-seed-phrase-mnemonics-generator