I took the index on the words, converted the number to binary, extra a few zeros, calculated the sha256 digest, took the main part of the hexadecimal to convert it to binary, additional 3 zeros on the eight digits on the binary and obtained 00000010011 which interprets to 19 in https://ezmarkbookmarks.com/story19010720/the-ultimate-guide-to-bip39-seed-phrase-mnemonics-generator