I took the index from the words, converted the quantity to binary, included 3 zeros, calculated the sha256 digest, took the 1st A part of the hexadecimal to convert it to binary, added 3 zeros to your eight digits of your binary and bought 00000010011 which interprets to 19 in https://socialinplace.com/story4229630/facts-about-bip39-seed-phrase-github-revealed