I took the index from the words, converted the amount to binary, additional 3 zeros, calculated the sha256 digest, took the main part of the hexadecimal to convert it to binary, extra 3 zeros to your 8 digits of the binary and received 00000010011 which translates to 19 in decimal. https://sites2000.com/story8441902/a-review-of-bip39-phrase-list