I took the index on the words, transformed the range to binary, extra three zeros, calculated the sha256 digest, took the first Section of the hexadecimal to convert it to binary, added a few zeros on the 8 digits of the binary and bought 00000010011 which translates to 19 in https://bookmarkhard.com/story19592640/the-fact-about-bip39-seed-phrase-word-list-that-no-one-is-suggesting