I took the index on the words, converted the range to binary, included a few zeros, calculated the sha256 digest, took the first A part of the hexadecimal to convert it to binary, additional three zeros for the 8 digits from the binary and acquired 00000010011 which translates to 19 https://health-lists.com/story19471328/5-simple-techniques-for-bip39-word-list-pdf