I took the index with the words, transformed the amount to binary, included three zeros, calculated the sha256 digest, took the very first part of the hexadecimal to convert it to binary, extra a few zeros towards the 8 digits with the binary and got 00000010011 which interprets to 19 https://bookmark-master.com/story19641994/the-fact-about-valid-bip39-seed-phrase-that-no-one-is-suggesting