I took the index of the words, transformed the number to binary, added three zeros, calculated the sha256 digest, took the 1st A part of the hexadecimal to transform it to binary, added a few zeros towards the 8 digits on the binary and got 00000010011 which interprets to 19 https://scrapbookmarket.com/story18826203/5-essential-elements-for-bip39-explained