I took the index of your words, converted the amount to binary, additional a few zeros, calculated the sha256 digest, took the very first Portion of the hexadecimal to convert it to binary, additional 3 zeros into the eight digits in the binary and received 00000010011 which translates to 19 https://bookmarkstime.com/story19193823/the-basic-principles-of-bip39-passphrase-generator