I took the index with the words, transformed the amount to binary, added a few zeros, calculated the sha256 digest, took the first A part of the hexadecimal to convert it to binary, extra 3 zeros on the 8 digits in the binary and acquired 00000010011 which interprets to 19 https://kingslists.com/story20022078/helping-the-others-realize-the-advantages-of-bip39-mnemonic-phrase-tool