I took the index of your words, transformed the number to binary, added three zeros, calculated the sha256 digest, took the primary Element of the hexadecimal to transform it to binary, included 3 zeros to the eight digits of the binary and got 00000010011 which interprets to 19 in decimal. https://bookmarkilo.com/story18746431/helping-the-others-realize-the-advantages-of-bip39-mnemonic-phrase-tool