I took the index in the words, converted the number to binary, included a few zeros, calculated the sha256 digest, took the initial Component of the hexadecimal to transform it to binary, additional three zeros towards the 8 digits with the binary and got 00000010011 which translates to 19 in https://bookmarklinking.com/story5170359/top-guidelines-of-bip39-word-list-pdf