I took the index with the words, converted the quantity to binary, added three zeros, calculated the sha256 digest, took the first A part of the hexadecimal to transform it to binary, included a few zeros on the eight digits with the binary and obtained 00000010011 which interprets to 19 https://thegreatbookmark.com/story18848137/facts-about-bip39-seed-phrase-github-revealed