I took the index in the words, transformed the amount to binary, included three zeros, calculated the sha256 digest, took the 1st A part of the hexadecimal to transform it to binary, extra 3 zeros into the 8 digits on the binary and bought 00000010011 which translates to 19 in https://bookmarksknot.com/story20701987/the-invalid-bip39-phrase-diaries