I took the index with the words, transformed the number to binary, added three zeros, calculated the sha256 digest, took the primary Portion of the hexadecimal to convert it to binary, extra three zeros into the eight digits of the binary and acquired 00000010011 which translates to 19 in decimal. https://bookmarksbay.com/story18929957/the-fact-about-valid-bip39-seed-phrase-that-no-one-is-suggesting