I took the index in the words, converted the amount to binary, extra a few zeros, calculated the sha256 digest, took the first Portion of the hexadecimal to transform it to binary, included three zeros for the 8 digits of your binary and received 00000010011 which translates to 19 in https://nimmansocial.com/story8575703/the-2-minute-rule-for-bip39-all-words