I took the index of the words, transformed the selection to binary, included 3 zeros, calculated the sha256 digest, took the initial Element of the hexadecimal to convert it to binary, extra a few zeros on the 8 digits with the binary and got 00000010011 which translates to 19 in https://linkedbookmarker.com/story4395450/5-simple-techniques-for-bip39-word-list-pdf