I took the index on the words, transformed the quantity to binary, added 3 zeros, calculated the sha256 digest, took the first A part of the hexadecimal to convert it to binary, extra three zeros for the 8 digits with the binary and got 00000010011 which interprets to 19 in https://bookmarkusers.com/story18856330/detailed-notes-on-copyright-wallet-seed-phrase-out-of-bip39