I took the index in the words, transformed the number to binary, added 3 zeros, calculated the sha256 digest, took the main Portion of the hexadecimal to convert it to binary, additional a few zeros on the eight digits in the binary and bought 00000010011 which translates to 19 in https://bookmarkfly.com/story18869078/new-step-by-step-map-for-ledger-seed-phrase-bip39