I took the index with the words, converted the variety to binary, included 3 zeros, calculated the sha256 digest, took the main A part of the hexadecimal to transform it to binary, extra 3 zeros towards the 8 digits of the binary and acquired 00000010011 which translates to 19 in https://easiestbookmarks.com/story18939063/fascination-about-invalid-bip39-phrase