I took the index of your words, converted the quantity to binary, additional 3 zeros, calculated the sha256 digest, took the initial Portion of the hexadecimal to convert it to binary, additional 3 zeros into the eight digits of your binary and received 00000010011 which interprets to 19 in decimal. https://mysocialport.com/story4392581/helping-the-others-realize-the-advantages-of-bip39-seed-phrase-mnemonics-generator