I took the index from the words, converted the variety to binary, included three zeros, calculated the sha256 digest, took the main A part of the hexadecimal to convert it to binary, included a few zeros on the 8 digits from the binary and received 00000010011 which translates to 19 https://allkindsofsocial.com/story4133933/fascination-about-bip39-english-words