I took the index in the words, converted the selection to binary, additional 3 zeros, calculated the sha256 digest, took the primary Component of the hexadecimal to transform it to binary, extra 3 zeros to your eight digits with the binary and bought 00000010011 which interprets to 19 in decimal. https://isocialfans.com/story4277084/little-known-facts-about-bip39-seed-phrase-list