I took the index on the words, transformed the amount to binary, included three zeros, calculated the sha256 digest, took the initial Element of the hexadecimal to convert it to binary, extra a few zeros for the eight digits in the binary and obtained 00000010011 which interprets to 19 in https://one-bookmark.com/story18971620/detailed-notes-on-copyright-wallet-seed-phrase-out-of-bip39