I took the index in the words, converted the number to binary, additional three zeros, calculated the sha256 digest, took the initial Portion of the hexadecimal to convert it to binary, added 3 zeros towards the 8 digits in the binary and received 00000010011 which translates to 19 in decimal. https://sound-social.com/story8856698/detailed-notes-on-copyright-wallet-seed-phrase-out-of-bip39