I took the index with the words, transformed the number to binary, added three zeros, calculated the sha256 digest, took the initial Section of the hexadecimal to transform it to binary, extra a few zeros for the 8 digits of the binary and obtained 00000010011 which interprets to 19 in https://bookmarkilo.com/story18831124/the-basic-principles-of-bip39-passphrase-generator