I took the index in the words, transformed the variety to binary, included three zeros, calculated the sha256 digest, took the initial Component of the hexadecimal to transform it to binary, included a few zeros to your eight digits on the binary and acquired 00000010011 which translates to 19 in https://mnobookmarks.com/story18881965/ledger-seed-phrase-bip39-no-further-a-mystery