I took the index with the words, converted the range to binary, added 3 zeros, calculated the sha256 digest, took the initial part of the hexadecimal to convert it to binary, included 3 zeros into the 8 digits of your binary and obtained 00000010011 which interprets to 19 in decimal. https://bookmarkplaces.com/story18790622/not-known-facts-about-bip39-english-words