I took the index with the words, converted the range to binary, extra 3 zeros, calculated the sha256 digest, took the main Portion of the hexadecimal to transform it to binary, added 3 zeros for the eight digits of the binary and acquired 00000010011 which interprets to 19 in decimal. https://geniusbookmarks.com/story19021574/fascination-about-invalid-bip39-phrase