I took the index in the words, converted the range to binary, extra a few zeros, calculated the sha256 digest, took the first Section of the hexadecimal to transform it to binary, included 3 zeros on the eight digits in the binary and obtained 00000010011 which translates to 19 in https://hypebookmarking.com/story18690840/5-simple-techniques-for-bip39-word-list-pdf