I took the index on the words, converted the variety to binary, included 3 zeros, calculated the sha256 digest, took the first part of the hexadecimal to transform it to binary, additional 3 zeros to the eight digits of your binary and acquired 00000010011 which interprets to 19 in decimal. https://mysocialguides.com/story4901958/a-secret-weapon-for-bip39-words-to-numbers