I took the index in the words, converted the range to binary, additional a few zeros, calculated the sha256 digest, took the primary Portion of the hexadecimal to convert it to binary, extra three zeros towards the 8 digits of the binary and obtained 00000010011 which translates to 19 in https://bookmarkmiracle.com/story20698604/detailed-notes-on-copyright-wallet-seed-phrase-out-of-bip39