I took the index on the words, converted the selection to binary, included 3 zeros, calculated the sha256 digest, took the first A part of the hexadecimal to convert it to binary, extra three zeros for the eight digits from the binary and obtained 00000010011 which translates to 19 in https://free-bookmarking.com/story18868306/5-simple-techniques-for-bip39-seed-phrase