I took the index of your words, transformed the selection to binary, added a few zeros, calculated the sha256 digest, took the first part of the hexadecimal to transform it to binary, additional three zeros into the 8 digits in the binary and obtained 00000010011 which translates to 19 in https://thejillist.com/story8907786/the-fact-about-bip39-seed-phrase-word-list-that-no-one-is-suggesting