I took the index of your words, converted the number to binary, additional a few zeros, calculated the sha256 digest, took the initial Component of the hexadecimal to convert it to binary, additional 3 zeros into the 8 digits on the binary and bought 00000010011 which translates to 19 in https://siambookmark.com/story19638309/ledger-seed-phrase-bip39-no-further-a-mystery