I took the index of the words, transformed the amount to binary, included three zeros, calculated the sha256 digest, took the first Section of the hexadecimal to transform it to binary, included three zeros to your 8 digits on the binary and got 00000010011 which interprets to 19 in decimal. https://socialskates.com/story20175399/an-unbiased-view-of-bip39-seed-phrase-github