I took the index from the words, transformed the number to binary, extra 3 zeros, calculated the sha256 digest, took the main Section of the hexadecimal to transform it to binary, additional 3 zeros to the 8 digits with the binary and received 00000010011 which interprets to 19 in decimal. https://bookmarksaifi.com/story19106671/5-essential-elements-for-bip39-explained