I took the index from the words, transformed the number to binary, added three zeros, calculated the sha256 digest, took the 1st A part of the hexadecimal to convert it to binary, added 3 zeros towards the 8 digits on the binary and acquired 00000010011 which translates to 19 in https://geilebookmarks.com/story18954891/the-basic-principles-of-bip39-passphrase-generator