I took the index on the words, transformed the selection to binary, added 3 zeros, calculated the sha256 digest, took the first Component of the hexadecimal to convert it to binary, included 3 zeros towards the 8 digits with the binary and acquired 00000010011 which translates to 19 in decimal. https://getsocialselling.com/story4902909/new-step-by-step-map-for-ledger-seed-phrase-bip39