I took the index in the words, converted the selection to binary, additional 3 zeros, calculated the sha256 digest, took the first Section of the hexadecimal to convert it to binary, included three zeros on the eight digits of the binary and obtained 00000010011 which translates to 19 in decimal. https://bookmarkity.com/story19225270/how-much-you-need-to-expect-you-ll-pay-for-a-good-bip39-seed-phrase-mnemonics-generator