I took the index with the words, converted the number to binary, added a few zeros, calculated the sha256 digest, took the primary Portion of the hexadecimal to convert it to binary, additional 3 zeros to your eight digits of the binary and acquired 00000010011 which translates to 19 in https://bookmarkextent.com/story20506049/the-fact-about-bip39-seed-phrase-word-list-that-no-one-is-suggesting