I took the index on the words, converted the quantity to binary, extra 3 zeros, calculated the sha256 digest, took the 1st Component of the hexadecimal to convert it to binary, extra a few zeros into the eight digits from the binary and bought 00000010011 which interprets to 19 in https://tinybookmarks.com/story18791359/the-fact-about-valid-bip39-seed-phrase-that-no-one-is-suggesting