I took the index of the words, transformed the variety to binary, included 3 zeros, calculated the sha256 digest, took the primary part of the hexadecimal to convert it to binary, included three zeros on the eight digits from the binary and received 00000010011 which interprets to 19 in decimal. https://funny-lists.com/story20655245/the-ultimate-guide-to-bip39-seed-phrase-github