I took the index of your words, converted the variety to binary, additional three zeros, calculated the sha256 digest, took the initial Portion of the hexadecimal to transform it to binary, extra 3 zeros towards the eight digits with the binary and acquired 00000010011 which interprets to 19 in decimal. https://bookmark-media.com/story19700892/invalid-bip39-phrase-things-to-know-before-you-buy