I took the index on the words, converted the selection to binary, additional 3 zeros, calculated the sha256 digest, took the first part of the hexadecimal to convert it to binary, extra three zeros towards the 8 digits with the binary and got 00000010011 which translates to 19 in decimal. https://socialrator.com/story9467599/the-ultimate-guide-to-bip39-seed-phrase-github