I took the index from the words, transformed the quantity to binary, additional 3 zeros, calculated the sha256 digest, took the very first Component of the hexadecimal to transform it to binary, added a few zeros to the eight digits from the binary and got 00000010011 which translates to 19 https://wearethelist.com/story20675227/invalid-bip39-phrase-things-to-know-before-you-buy