I took the index with the words, converted the amount to binary, additional 3 zeros, calculated the sha256 digest, took the initial part of the hexadecimal to transform it to binary, added three zeros to the 8 digits of the binary and acquired 00000010011 which interprets to 19 in decimal. https://total-bookmark.com/story18696023/not-known-factual-statements-about-bip39-explained