I took the index in the words, converted the variety to binary, added 3 zeros, calculated the sha256 digest, took the main part of the hexadecimal to transform it to binary, added 3 zeros to the 8 digits with the binary and received 00000010011 which translates to 19 in decimal. https://moodjhomedia.com/story2599552/a-review-of-bip39