I took the index with the words, transformed the amount to binary, extra 3 zeros, calculated the sha256 digest, took the 1st Portion of the hexadecimal to convert it to binary, additional three zeros towards the 8 digits from the binary and got 00000010011 which interprets to 19 in decimal. https://wavesocialmedia.com/story4436872/an-unbiased-view-of-bip39-seed-phrase-github