I took the index from the words, transformed the variety to binary, included a few zeros, calculated the sha256 digest, took the first Component of the hexadecimal to convert it to binary, extra 3 zeros for the eight digits in the binary and received 00000010011 which translates to 19 in https://socialdummies.com/story3671696/the-basic-principles-of-bip39-passphrase-generator