I took the index of the words, converted the range to binary, added three zeros, calculated the sha256 digest, took the initial Section of the hexadecimal to transform it to binary, extra three zeros on the eight digits on the binary and obtained 00000010011 which translates to 19 in decimal. https://nowbookmarks.com/story18934208/an-unbiased-view-of-bip39-seed-phrase-github