I took the index of the words, converted the range to binary, included a few zeros, calculated the sha256 digest, took the main Portion of the hexadecimal to convert it to binary, additional three zeros into the eight digits from the binary and obtained 00000010011 which interprets to 19 in https://bookmarkinglife.com/story4366379/invalid-bip39-phrase-things-to-know-before-you-buy