I took the index in the words, converted the variety to binary, extra a few zeros, calculated the sha256 digest, took the main Element of the hexadecimal to transform it to binary, included three zeros towards the 8 digits on the binary and obtained 00000010011 which interprets to 19 in https://bookmarkity.com/story18881139/considerations-to-know-about-bip39-word-list-pdf