I took the index on the words, transformed the quantity to binary, included three zeros, calculated the sha256 digest, took the initial Portion of the hexadecimal to transform it to binary, included three zeros on the 8 digits with the binary and obtained 00000010011 which translates to 19 in decimal. https://bookmarkfame.com/story18681311/facts-about-bip39-seed-phrase-word-list-revealed