I took the index on the words, transformed the amount to binary, extra 3 zeros, calculated the sha256 digest, took the main A part of the hexadecimal to convert it to binary, extra 3 zeros for the 8 digits in the binary and bought 00000010011 which translates to 19 in https://thebookpage.com/story4247684/little-known-facts-about-bip39-seed-phrase-list