I took the index from the words, transformed the amount to binary, included 3 zeros, calculated the sha256 digest, took the first part of the hexadecimal to transform it to binary, added three zeros for the 8 digits of your binary and bought 00000010011 which translates to 19 in decimal. https://adsbookmark.com/story18836343/the-invalid-bip39-phrase-diaries