I took the index from the words, converted the amount to binary, added 3 zeros, calculated the sha256 digest, took the very first A part of the hexadecimal to convert it to binary, additional three zeros on the 8 digits on the binary and obtained 00000010011 which translates to 19 https://bookmarkstown.com/story19050988/the-5-second-trick-for-ledger-seed-phrase-bip39