I took the index from the words, transformed the range to binary, extra a few zeros, calculated the sha256 digest, took the initial Section of the hexadecimal to transform it to binary, added three zeros on the 8 digits with the binary and acquired 00000010011 which translates to 19 in https://bookmarketmaven.com/story19381412/the-basic-principles-of-bip39-passphrase-generator