I took the index of the words, converted the quantity to binary, added a few zeros, calculated the sha256 digest, took the main Element of the hexadecimal to transform it to binary, included a few zeros into the 8 digits in the binary and got 00000010011 which translates to 19 https://bookmarkinglife.com/story4691725/the-fact-about-valid-bip39-seed-phrase-that-no-one-is-suggesting