I took the index in the words, converted the amount to binary, additional 3 zeros, calculated the sha256 digest, took the initial part of the hexadecimal to transform it to binary, extra a few zeros towards the eight digits from the binary and got 00000010011 which translates to 19 in https://growthbookmarks.com/story18741756/how-much-you-need-to-expect-you-ll-pay-for-a-good-bip39-definition