I took the index in the words, converted the range to binary, additional a few zeros, calculated the sha256 digest, took the very first A part of the hexadecimal to transform it to binary, extra 3 zeros into the 8 digits with the binary and received 00000010011 which interprets to https://bookmarksfocus.com/story4597930/the-basic-principles-of-bip39-passphrase-generator