I took the index from the words, transformed the quantity to binary, included three zeros, calculated the sha256 digest, took the 1st A part of the hexadecimal to convert it to binary, extra three zeros to the eight digits of the binary and obtained 00000010011 which interprets to 19 in https://maximusbookmarks.com/story19168201/examine-this-report-on-bip39-mnemonic-phrase-tool