I took the index of your words, converted the number to binary, additional 3 zeros, calculated the sha256 digest, took the primary Component of the hexadecimal to convert it to binary, included 3 zeros for the eight digits on the binary and received 00000010011 which interprets to 19 in decimal. https://bookmarkoffire.com/story18782193/a-secret-weapon-for-bip39-words-to-numbers