I took the index in the words, converted the number to binary, additional a few zeros, calculated the sha256 digest, took the main Component of the hexadecimal to transform it to binary, added three zeros into the eight digits in the binary and acquired 00000010011 which translates to 19 in https://ariabookmarks.com/story4656142/invalid-bip39-phrase-things-to-know-before-you-buy