I took the index with the words, transformed the amount to binary, extra 3 zeros, calculated the sha256 digest, took the main A part of the hexadecimal to convert it to binary, additional three zeros for the 8 digits from the binary and received 00000010011 which translates to 19 in https://socialclubfm.com/story9287125/helping-the-others-realize-the-advantages-of-bip39-mnemonic-phrase-tool