I took the index in the words, transformed the selection to binary, additional a few zeros, calculated the sha256 digest, took the very first Component of the hexadecimal to convert it to binary, added 3 zeros to the 8 digits of your binary and received 00000010011 which interprets to 19 https://bookmarksusa.com/story19068455/a-review-of-bip39-phrase-list