I took the index on the words, transformed the selection to binary, included a few zeros, calculated the sha256 digest, took the first A part of the hexadecimal to convert it to binary, extra 3 zeros on the eight digits on the binary and got 00000010011 which interprets to 19 https://networkbookmarks.com/story19612325/an-unbiased-view-of-bip39-seed-phrase-github