I took the index in the words, transformed the range to binary, additional 3 zeros, calculated the sha256 digest, took the main Portion of the hexadecimal to transform it to binary, added three zeros for the 8 digits on the binary and obtained 00000010011 which interprets to 19 in decimal. https://bookmarkingfeed.com/story18788788/helping-the-others-realize-the-advantages-of-bip39-mnemonic-phrase-tool