I took the index of your words, transformed the number to binary, extra a few zeros, calculated the sha256 digest, took the first Element of the hexadecimal to transform it to binary, added a few zeros to the 8 digits from the binary and received 00000010011 which translates to 19 https://socialstrategie.com/story4538905/a-secret-weapon-for-bip39-words-to-numbers