I took the index in the words, converted the quantity to binary, included a few zeros, calculated the sha256 digest, took the main Component of the hexadecimal to convert it to binary, added three zeros into the 8 digits from the binary and obtained 00000010011 which translates to 19 in https://enrollbookmarks.com/story18899377/facts-about-bip39-seed-phrase-github-revealed