I took the index of the words, converted the selection to binary, extra 3 zeros, calculated the sha256 digest, took the main Portion of the hexadecimal to convert it to binary, extra 3 zeros to your eight digits of the binary and acquired 00000010011 which interprets to 19 in decimal. https://socialbookmarkgs.com/story19077985/helping-the-others-realize-the-advantages-of-bip39-mnemonic-phrase-tool