I took the index of your words, transformed the amount to binary, added 3 zeros, calculated the sha256 digest, took the first A part of the hexadecimal to convert it to binary, added 3 zeros to your 8 digits with the binary and received 00000010011 which translates to 19 in https://bookmarkproduct.com/story19041168/top-guidelines-of-bip39-word-list-pdf