I took the index in the words, converted the amount to binary, included three zeros, calculated the sha256 digest, took the 1st A part of the hexadecimal to transform it to binary, added 3 zeros into the 8 digits on the binary and got 00000010011 which interprets to 19 in https://socialupme.com/story4523681/top-guidelines-of-bip39-word-list-pdf