I took the index in the words, converted the range to binary, additional three zeros, calculated the sha256 digest, took the primary part of the hexadecimal to convert it to binary, additional 3 zeros towards the eight digits from the binary and got 00000010011 which translates to 19 in decimal. https://getsocialsource.com/story4207906/5-simple-techniques-for-bip39-seed-phrase