I took the index of the words, converted the variety to binary, added 3 zeros, calculated the sha256 digest, took the first Component of the hexadecimal to convert it to binary, added three zeros on the eight digits of the binary and acquired 00000010011 which translates to 19 in decimal. https://gogogobookmarks.com/story18824347/invalid-bip39-phrase-things-to-know-before-you-buy