I took the index on the words, transformed the amount to binary, added three zeros, calculated the sha256 digest, took the initial Component of the hexadecimal to transform it to binary, additional a few zeros to your 8 digits in the binary and obtained 00000010011 which translates to 19 in https://bookmarkspiral.com/story18849350/helping-the-others-realize-the-advantages-of-bip39-mnemonic-phrase-tool