I took the index on the words, converted the selection to binary, included 3 zeros, calculated the sha256 digest, took the first part of the hexadecimal to transform it to binary, additional 3 zeros into the 8 digits with the binary and got 00000010011 which interprets to 19 in decimal. https://bookmarkingbay.com/story19136004/an-unbiased-view-of-bip39-seed-phrase-github