I took the index with the words, transformed the selection to binary, extra three zeros, calculated the sha256 digest, took the 1st Component of the hexadecimal to transform it to binary, additional a few zeros towards the 8 digits on the binary and got 00000010011 which translates to 19 in https://mypresspage.com/story4240920/5-simple-techniques-for-bip39-word-list-pdf