I took the index in the words, transformed the selection to binary, additional 3 zeros, calculated the sha256 digest, took the 1st Section of the hexadecimal to transform it to binary, additional 3 zeros to your eight digits of your binary and got 00000010011 which translates to 19 in decimal. https://thebookmarknight.com/story18814385/a-review-of-bip39-phrase-list