I took the index of your words, transformed the range to binary, included a few zeros, calculated the sha256 digest, took the main part of the hexadecimal to transform it to binary, included a few zeros to your eight digits of your binary and received 00000010011 which translates to 19 https://socialwoot.com/story20531696/detailed-notes-on-copyright-wallet-seed-phrase-out-of-bip39