I took the index from the words, transformed the variety to binary, added a few zeros, calculated the sha256 digest, took the initial Portion of the hexadecimal to transform it to binary, added 3 zeros to the 8 digits in the binary and got 00000010011 which translates to 19 in https://bookmarkspiral.com/story19497353/5-simple-techniques-for-bip39-word-list-pdf