I took the index of the words, transformed the number to binary, extra a few zeros, calculated the sha256 digest, took the main Portion of the hexadecimal to transform it to binary, included a few zeros on the 8 digits with the binary and got 00000010011 which translates to 19 https://ok-social.com/story4274164/5-simple-techniques-for-bip39-word-list-pdf