I took the index of your words, transformed the quantity to binary, additional a few zeros, calculated the sha256 digest, took the main Element of the hexadecimal to transform it to binary, added three zeros to the eight digits on the binary and acquired 00000010011 which interprets to 19 in https://minibookmarking.com/story19260511/ledger-seed-phrase-bip39-no-further-a-mystery