I took the index in the words, converted the amount to binary, added three zeros, calculated the sha256 digest, took the 1st A part of the hexadecimal to convert it to binary, added 3 zeros towards the eight digits of your binary and acquired 00000010011 which interprets to 19 in https://bookmarksparkle.com/story19599454/the-fact-about-valid-bip39-seed-phrase-that-no-one-is-suggesting