I took the index in the words, converted the quantity to binary, added three zeros, calculated the sha256 digest, took the initial Section of the hexadecimal to transform it to binary, extra 3 zeros to the 8 digits with the binary and obtained 00000010011 which interprets to 19 in decimal. https://bookmarkproduct.com/story18996161/the-fact-about-bip39-seed-phrase-word-list-that-no-one-is-suggesting