I took the index with the words, converted the quantity to binary, extra 3 zeros, calculated the sha256 digest, took the first Section of the hexadecimal to convert it to binary, added 3 zeros to your eight digits of the binary and acquired 00000010011 which translates to 19 in decimal. https://bookmarkboom.com/story18978413/top-guidelines-of-bip39-word-list-pdf