I took the index from the words, transformed the range to binary, included a few zeros, calculated the sha256 digest, took the very first Section of the hexadecimal to convert it to binary, additional three zeros into the 8 digits on the binary and bought 00000010011 which interprets to 19 https://meshbookmarks.com/story18888449/ledger-seed-phrase-bip39-no-further-a-mystery