I took the index of the words, converted the range to binary, added 3 zeros, calculated the sha256 digest, took the first Portion of the hexadecimal to transform it to binary, added 3 zeros to the 8 digits with the binary and received 00000010011 which interprets to 19 in decimal. https://thebookpage.com/story4224497/top-guidelines-of-bip39-word-list-pdf