I took the index of the words, transformed the selection to binary, extra a few zeros, calculated the sha256 digest, took the main Element of the hexadecimal to transform it to binary, extra 3 zeros on the 8 digits in the binary and got 00000010011 which interprets to 19 in https://wearethelist.com/story20726102/considerations-to-know-about-bip39-word-list-pdf