I took the index in the words, converted the quantity to binary, added three zeros, calculated the sha256 digest, took the initial Element of the hexadecimal to transform it to binary, included a few zeros to the 8 digits from the binary and received 00000010011 which translates to 19 in https://bookmark-media.com/story18940639/the-fact-about-valid-bip39-seed-phrase-that-no-one-is-suggesting