I took the index in the words, transformed the number to binary, included 3 zeros, calculated the sha256 digest, took the first Element of the hexadecimal to transform it to binary, extra three zeros on the eight digits in the binary and obtained 00000010011 which translates to 19 in decimal. https://bookmarkstumble.com/story20487371/how-much-you-need-to-expect-you-ll-pay-for-a-good-bip39-seed-phrase-mnemonics-generator