I took the index of the words, converted the range to binary, added three zeros, calculated the sha256 digest, took the primary part of the hexadecimal to convert it to binary, extra 3 zeros into the 8 digits on the binary and got 00000010011 which interprets to 19 in decimal. https://bookmarkize.com/story19050644/invalid-bip39-phrase-things-to-know-before-you-buy