I took the index from the words, transformed the range to binary, extra three zeros, calculated the sha256 digest, took the initial Component of the hexadecimal to convert it to binary, extra a few zeros to the 8 digits on the binary and got 00000010011 which translates to 19 in https://followbookmarks.com/story18922322/helping-the-others-realize-the-advantages-of-bip39-seed-phrase-mnemonics-generator