I took the index on the words, transformed the range to binary, extra 3 zeros, calculated the sha256 digest, took the primary Element of the hexadecimal to transform it to binary, included a few zeros for the eight digits with the binary and received 00000010011 which translates to 19 in https://setbookmarks.com/story18900420/helping-the-others-realize-the-advantages-of-bip39-seed-phrase-mnemonics-generator