I took the index with the words, converted the number to binary, included 3 zeros, calculated the sha256 digest, took the very first part of the hexadecimal to transform it to binary, additional three zeros to your 8 digits of the binary and obtained 00000010011 which translates to 19 in https://userbookmark.com/story18993230/new-step-by-step-map-for-bip39-english-words