I took the index of your words, transformed the range to binary, extra three zeros, calculated the sha256 digest, took the main A part of the hexadecimal to convert it to binary, additional a few zeros to your 8 digits of the binary and obtained 00000010011 which translates to 19 https://techonpage.com/story4547669/the-2-minute-rule-for-bip39-all-words