I took the index in the words, converted the variety to binary, extra a few zeros, calculated the sha256 digest, took the first Element of the hexadecimal to convert it to binary, included three zeros into the 8 digits with the binary and got 00000010011 which interprets to 19 in https://bookmarktune.com/story19053356/considerations-to-know-about-bip39-seed-phrase-generator