I took the index with the words, transformed the quantity to binary, additional 3 zeros, calculated the sha256 digest, took the primary Element of the hexadecimal to convert it to binary, added three zeros for the 8 digits on the binary and acquired 00000010011 which interprets to 19 in decimal. https://adsbookmark.com/story18835016/facts-about-bip39-seed-phrase-github-revealed