I took the index in the words, transformed the quantity to binary, extra a few zeros, calculated the sha256 digest, took the initial Portion of the hexadecimal to transform it to binary, additional three zeros to your 8 digits in the binary and got 00000010011 which interprets to 19 in https://gatherbookmarks.com/story19517292/not-known-facts-about-bip39-english-words