I took the index from the words, converted the number to binary, additional three zeros, calculated the sha256 digest, took the initial Portion of the hexadecimal to convert it to binary, included 3 zeros on the 8 digits from the binary and received 00000010011 which interprets to 19 in decimal. https://webookmarks.com/story4334082/the-invalid-bip39-phrase-diaries