I took the index on the words, converted the range to binary, additional 3 zeros, calculated the sha256 digest, took the 1st A part of the hexadecimal to convert it to binary, included 3 zeros on the eight digits with the binary and obtained 00000010011 which interprets to 19 in https://e-bookmarks.com/story4515632/the-basic-principles-of-bip39-passphrase-generator