I took the index on the words, converted the selection to binary, additional 3 zeros, calculated the sha256 digest, took the initial Component of the hexadecimal to convert it to binary, included 3 zeros for the eight digits with the binary and got 00000010011 which translates to 19 in decimal. https://bookmarkcolumn.com/story18635177/facts-about-bip39-seed-phrase-word-list-revealed