I took the index from the words, transformed the amount to binary, included three zeros, calculated the sha256 digest, took the 1st A part of the hexadecimal to convert it to binary, added 3 zeros into the 8 digits in the binary and obtained 00000010011 which translates to 19 in https://livebookmarking.com/story19453214/the-fact-about-valid-bip39-seed-phrase-that-no-one-is-suggesting