I took the index from the words, converted the quantity to binary, added three zeros, calculated the sha256 digest, took the first A part of the hexadecimal to transform it to binary, extra a few zeros to your eight digits of the binary and got 00000010011 which translates to 19 https://listbell.com/story8518262/detailed-notes-on-copyright-wallet-seed-phrase-out-of-bip39