I took the index on the words, transformed the selection to binary, added 3 zeros, calculated the sha256 digest, took the 1st Element of the hexadecimal to transform it to binary, added a few zeros on the 8 digits of the binary and received 00000010011 which translates to 19 in https://one-bookmark.com/story18744573/examine-this-report-on-bip39-passphrase