I took the index from the words, transformed the number to binary, extra a few zeros, calculated the sha256 digest, took the initial Element of the hexadecimal to convert it to binary, extra 3 zeros to the 8 digits of your binary and bought 00000010011 which interprets to 19 in https://maroonbookmarks.com/story18939828/bip39-seed-phrase-fundamentals-explained