I took the index with the words, converted the range to binary, additional 3 zeros, calculated the sha256 digest, took the very first A part of the hexadecimal to transform it to binary, extra 3 zeros to the eight digits from the binary and obtained 00000010011 which translates to 19 https://bookmarkeasier.com/story19329545/the-greatest-guide-to-seed-phrase-bip39