I took the index of your words, transformed the selection to binary, included a few zeros, calculated the sha256 digest, took the 1st Component of the hexadecimal to transform it to binary, additional three zeros to your 8 digits of your binary and received 00000010011 which translates to 19 in https://bookmark-dofollow.com/story21948785/facts-about-bip39-seed-phrase-word-list-revealed