I took the index on the words, transformed the range to binary, extra 3 zeros, calculated the sha256 digest, took the first A part of the hexadecimal to convert it to binary, added three zeros to your eight digits of your binary and acquired 00000010011 which interprets to 19 in https://socialbuzzfeed.com/story4268432/the-ultimate-guide-to-bip39-seed-phrase-github