I took the index of the words, converted the selection to binary, extra 3 zeros, calculated the sha256 digest, took the first part of the hexadecimal to transform it to binary, included a few zeros to your 8 digits of the binary and got 00000010011 which translates to 19 in https://bookmarkpagerank.com/story18841857/bip39-seed-phrase-mnemonics-generator-an-overview