I took the index on the words, transformed the quantity to binary, added three zeros, calculated the sha256 digest, took the main A part of the hexadecimal to convert it to binary, added a few zeros to the eight digits of your binary and bought 00000010011 which interprets to 19 https://exactlybookmarks.com/story18907854/ledger-seed-phrase-bip39-no-further-a-mystery