I took the index in the words, converted the variety to binary, extra three zeros, calculated the sha256 digest, took the primary Component of the hexadecimal to transform it to binary, extra a few zeros for the 8 digits of the binary and got 00000010011 which interprets to 19 in https://mnobookmarks.com/story18836501/facts-about-bip39-seed-phrase-github-revealed