I took the index in the words, transformed the quantity to binary, extra 3 zeros, calculated the sha256 digest, took the first part of the hexadecimal to convert it to binary, additional a few zeros towards the 8 digits in the binary and bought 00000010011 which translates to 19 in https://esocialmall.com/story4427559/the-5-second-trick-for-ledger-seed-phrase-bip39