I took the index of your words, converted the amount to binary, extra a few zeros, calculated the sha256 digest, took the 1st Section of the hexadecimal to convert it to binary, additional three zeros to the eight digits of your binary and acquired 00000010011 which translates to 19 in https://socialbuzzfeed.com/story4283098/5-simple-techniques-for-bip39-seed-phrase