I took the index in the words, transformed the amount to binary, extra 3 zeros, calculated the sha256 digest, took the primary Element of the hexadecimal to transform it to binary, extra 3 zeros on the eight digits of your binary and bought 00000010011 which interprets to 19 in decimal. https://madbookmarks.com/story18813315/considerations-to-know-about-bip39-word-list-pdf