I took the index of the words, transformed the number to binary, added three zeros, calculated the sha256 digest, took the very first A part of the hexadecimal to convert it to binary, additional three zeros to the eight digits of your binary and obtained 00000010011 which interprets to 19 https://mysitesname.com/story8714723/the-2-minute-rule-for-bip39-all-words