I took the index of the words, converted the quantity to binary, extra 3 zeros, calculated the sha256 digest, took the 1st Element of the hexadecimal to transform it to binary, included 3 zeros for the 8 digits in the binary and bought 00000010011 which interprets to 19 in decimal. https://orangebookmarks.com/story19666725/little-known-facts-about-bip39-words