I took the index on the words, transformed the amount to binary, included three zeros, calculated the sha256 digest, took the primary part of the hexadecimal to transform it to binary, included three zeros on the eight digits from the binary and acquired 00000010011 which interprets to 19 in decimal. https://bookmarkmargin.com/story18852085/an-unbiased-view-of-bip39-seed-phrase-github