I took the index on the words, transformed the amount to binary, included three zeros, calculated the sha256 digest, took the first Section of the hexadecimal to convert it to binary, included three zeros on the 8 digits on the binary and bought 00000010011 which interprets to 19 in decimal. https://ztndz.com/story22278219/top-guidelines-of-bip39-word-list-pdf