I took the index of the words, converted the variety to binary, additional 3 zeros, calculated the sha256 digest, took the 1st Element of the hexadecimal to convert it to binary, additional 3 zeros on the 8 digits of your binary and bought 00000010011 which interprets to 19 in decimal. https://bookmarkblast.com/story18850268/the-basic-principles-of-bip39-passphrase-generator