I took the index on the words, converted the range to binary, extra 3 zeros, calculated the sha256 digest, took the first Section of the hexadecimal to transform it to binary, extra 3 zeros into the eight digits of the binary and got 00000010011 which translates to 19 in decimal. https://userbookmark.com/story18951163/bip39-phrase-generator-can-be-fun-for-anyone