I took the index of the words, transformed the amount to binary, added three zeros, calculated the sha256 digest, took the primary A part of the hexadecimal to convert it to binary, included 3 zeros to the 8 digits with the binary and obtained 00000010011 which translates to 19 in https://bookmarksystem.com/story18865216/little-known-facts-about-bip39-words