I took the index of the words, transformed the number to binary, added three zeros, calculated the sha256 digest, took the first Element of the hexadecimal to convert it to binary, extra 3 zeros for the eight digits on the binary and bought 00000010011 which translates to 19 in decimal. https://madbookmarks.com/story18794652/not-known-facts-about-bip39-english-words