I took the index from the words, converted the number to binary, included a few zeros, calculated the sha256 digest, took the initial Component of the hexadecimal to transform it to binary, extra a few zeros for the 8 digits on the binary and obtained 00000010011 which interprets to 19 https://sitesrow.com/story8646525/helping-the-others-realize-the-advantages-of-bip39-seed-phrase-mnemonics-generator