I took the index of the words, transformed the quantity to binary, additional three zeros, calculated the sha256 digest, took the 1st Component of the hexadecimal to transform it to binary, extra 3 zeros on the eight digits with the binary and obtained 00000010011 which translates to 19 in decimal. https://socialbuzzmaster.com/story4375191/bip39-phrase-generator-can-be-fun-for-anyone