I took the index with the words, transformed the amount to binary, extra 3 zeros, calculated the sha256 digest, took the main A part of the hexadecimal to transform it to binary, added three zeros to the eight digits with the binary and obtained 00000010011 which translates to 19 in https://webookmarks.com/story4481595/not-known-factual-statements-about-bip39-explained