I took the index of the words, converted the amount to binary, extra 3 zeros, calculated the sha256 digest, took the initial Element of the hexadecimal to transform it to binary, included three zeros towards the eight digits of the binary and obtained 00000010011 which translates to 19 in decimal. https://bookmarks-hit.com/story19608896/the-fact-about-bip39-seed-phrase-word-list-that-no-one-is-suggesting