I took the index of your words, transformed the amount to binary, added a few zeros, calculated the sha256 digest, took the 1st A part of the hexadecimal to convert it to binary, additional 3 zeros for the eight digits from the binary and received 00000010011 which translates to 19 https://bookmarkshut.com/story20857876/the-fact-about-valid-bip39-seed-phrase-that-no-one-is-suggesting