I took the index from the words, transformed the amount to binary, included three zeros, calculated the sha256 digest, took the primary part of the hexadecimal to convert it to binary, extra a few zeros to the 8 digits from the binary and obtained 00000010011 which interprets to 19 in https://socialfactories.com/story4296512/helping-the-others-realize-the-advantages-of-bip39-mnemonic-phrase-tool