I took the index of your words, converted the range to binary, added 3 zeros, calculated the sha256 digest, took the first Section of the hexadecimal to convert it to binary, included three zeros to your 8 digits of the binary and acquired 00000010011 which interprets to 19 in decimal. https://bookmarktune.com/story19379717/helping-the-others-realize-the-advantages-of-bip39-seed-phrase-mnemonics-generator