I took the index from the words, transformed the range to binary, included three zeros, calculated the sha256 digest, took the first Component of the hexadecimal to convert it to binary, extra three zeros for the eight digits on the binary and obtained 00000010011 which interprets to 19 in decimal. https://listingbookmarks.com/story18879593/considerations-to-know-about-bip39-seed-phrase-generator