I took the index with the words, converted the variety to binary, added a few zeros, calculated the sha256 digest, took the initial Portion of the hexadecimal to transform it to binary, additional 3 zeros to the 8 digits with the binary and obtained 00000010011 which translates to 19 in https://dmozbookmark.com/story19498182/the-2-minute-rule-for-bip39-all-words