I took the index with the words, transformed the range to binary, added a few zeros, calculated the sha256 digest, took the 1st part of the hexadecimal to transform it to binary, included a few zeros to the eight digits of your binary and got 00000010011 which interprets to 19 https://ilovebookmark.com/story18753824/top-guidelines-of-bip39-word-list-pdf