I took the index of your words, converted the range to binary, added three zeros, calculated the sha256 digest, took the primary Element of the hexadecimal to transform it to binary, included a few zeros to your 8 digits in the binary and received 00000010011 which translates to 19 in https://hotbookmarkings.com/story18846863/considerations-to-know-about-bip39-seed-phrase-generator