I took the index of the words, transformed the range to binary, added three zeros, calculated the sha256 digest, took the initial Section of the hexadecimal to convert it to binary, additional 3 zeros on the eight digits with the binary and obtained 00000010011 which translates to 19 in decimal. https://bookmarkdistrict.com/story18607966/the-definitive-guide-to-bip39-seed-phrase