I took the index of the words, transformed the selection to binary, extra 3 zeros, calculated the sha256 digest, took the primary Element of the hexadecimal to convert it to binary, included 3 zeros into the 8 digits on the binary and obtained 00000010011 which interprets to 19 in decimal. https://esocialmall.com/story4211757/an-unbiased-view-of-bip39-seed-phrase-github