I took the index of the words, converted the selection to binary, additional 3 zeros, calculated the sha256 digest, took the initial A part of the hexadecimal to convert it to binary, included 3 zeros towards the eight digits of your binary and obtained 00000010011 which interprets to 19 in https://thebookmarknight.com/story18840616/helping-the-others-realize-the-advantages-of-bip39-mnemonic-phrase-tool