I took the index of the words, transformed the variety to binary, included 3 zeros, calculated the sha256 digest, took the initial part of the hexadecimal to transform it to binary, additional a few zeros to your 8 digits of your binary and acquired 00000010011 which translates to 19 in https://moodjhomedia.com/story2871134/a-review-of-bip39-passphrase