I took the index in the words, converted the selection to binary, included a few zeros, calculated the sha256 digest, took the initial Section of the hexadecimal to transform it to binary, added a few zeros to your 8 digits on the binary and received 00000010011 which interprets to 19 https://minibookmarking.com/story19587136/5-simple-techniques-for-bip39-word-list-pdf