I took the index of the words, transformed the variety to binary, extra a few zeros, calculated the sha256 digest, took the primary Element of the hexadecimal to transform it to binary, included three zeros on the 8 digits on the binary and obtained 00000010011 which interprets to 19 in https://thesocialvibes.com/story4322567/facts-about-bip39-seed-phrase-github-revealed