I took the index in the words, transformed the number to binary, added 3 zeros, calculated the sha256 digest, took the first A part of the hexadecimal to transform it to binary, extra 3 zeros for the 8 digits in the binary and acquired 00000010011 which interprets to 19 in https://bookmark-media.com/story18886172/facts-about-bip39-seed-phrase-github-revealed