I took the index on the words, transformed the number to binary, additional three zeros, calculated the sha256 digest, took the main Component of the hexadecimal to convert it to binary, additional three zeros to the 8 digits of your binary and received 00000010011 which interprets to 19 in decimal. https://scrapbookmarket.com/story18812312/the-2-minute-rule-for-bip39-all-words