I took the index from the words, converted the quantity to binary, extra 3 zeros, calculated the sha256 digest, took the very first part of the hexadecimal to transform it to binary, additional three zeros to the eight digits of the binary and received 00000010011 which translates to 19 in https://bookmarkspy.com/story20324955/the-ultimate-guide-to-bip39-seed-phrase-github