I took the index from the words, transformed the number to binary, included three zeros, calculated the sha256 digest, took the 1st A part of the hexadecimal to convert it to binary, additional three zeros for the 8 digits on the binary and acquired 00000010011 which interprets to 19 in https://bookmarkspedia.com/story4542032/helping-the-others-realize-the-advantages-of-bip39-seed-phrase-mnemonics-generator