I took the index in the words, transformed the number to binary, additional 3 zeros, calculated the sha256 digest, took the 1st A part of the hexadecimal to transform it to binary, added 3 zeros on the 8 digits of the binary and received 00000010011 which translates to 19 in https://bouchesocial.com/story20753040/detailed-notes-on-copyright-wallet-seed-phrase-out-of-bip39