I took the index in the words, transformed the quantity to binary, extra 3 zeros, calculated the sha256 digest, took the very first Section of the hexadecimal to convert it to binary, additional 3 zeros to your eight digits with the binary and got 00000010011 which interprets to 19 in https://bookmarkinginfo.com/story18838405/5-simple-techniques-for-bip39-seed-phrase