I took the index of the words, transformed the number to binary, included 3 zeros, calculated the sha256 digest, took the main Element of the hexadecimal to transform it to binary, added 3 zeros for the eight digits from the binary and received 00000010011 which translates to 19 in decimal. https://wavesocialmedia.com/story4436643/the-basic-principles-of-bip39-passphrase-generator