I took the index on the words, transformed the range to binary, extra 3 zeros, calculated the sha256 digest, took the 1st part of the hexadecimal to transform it to binary, included 3 zeros on the 8 digits on the binary and acquired 00000010011 which translates to 19 in decimal. https://getsocialpr.com/story20023263/facts-about-bip39-seed-phrase-github-revealed