I took the index from the words, converted the variety to binary, additional 3 zeros, calculated the sha256 digest, took the main A part of the hexadecimal to transform it to binary, additional a few zeros on the 8 digits in the binary and got 00000010011 which interprets to 19 https://getsocialnetwork.com/story4276310/a-review-of-bip39-passphrase