I took the index of your words, converted the amount to binary, additional a few zeros, calculated the sha256 digest, took the main part of the hexadecimal to transform it to binary, included 3 zeros into the eight digits from the binary and got 00000010011 which interprets to 19 in https://yesbookmarks.com/story18927899/top-guidelines-of-bip39-word-list-pdf