I took the index with the words, transformed the selection to binary, added three zeros, calculated the sha256 digest, took the very first Element of the hexadecimal to convert it to binary, additional a few zeros to your 8 digits of your binary and obtained 00000010011 which translates to 19 https://esocialmall.com/story5022624/an-unbiased-view-of-bip39-seed-phrase-github