I took the index with the words, converted the amount to binary, extra a few zeros, calculated the sha256 digest, took the 1st A part of the hexadecimal to convert it to binary, included 3 zeros on the eight digits of your binary and got 00000010011 which translates to 19 https://bookmarkinglive.com/story19665619/the-2-minute-rule-for-bip39-all-words