I took the index in the words, transformed the number to binary, extra 3 zeros, calculated the sha256 digest, took the main A part of the hexadecimal to transform it to binary, added 3 zeros to the 8 digits from the binary and obtained 00000010011 which interprets to 19 in https://bookmarkpressure.com/story18763008/a-secret-weapon-for-bip39-words-to-numbers