I took the index from the words, transformed the quantity to binary, extra a few zeros, calculated the sha256 digest, took the initial Element of the hexadecimal to convert it to binary, extra three zeros for the eight digits from the binary and obtained 00000010011 which interprets to 19 in https://bookmarklayer.com/story19054180/considerations-to-know-about-bip39-seed-phrase-generator