I took the index with the words, transformed the amount to binary, included 3 zeros, calculated the sha256 digest, took the main Portion of the hexadecimal to transform it to binary, included a few zeros into the 8 digits from the binary and received 00000010011 which translates to 19 in https://socialmediaentry.com/story4268202/helping-the-others-realize-the-advantages-of-bip39-mnemonic-phrase-tool