I took the index of your words, transformed the range to binary, added three zeros, calculated the sha256 digest, took the very first part of the hexadecimal to convert it to binary, extra three zeros on the 8 digits of the binary and acquired 00000010011 which translates to 19 in https://bookmarks4seo.com/story18794783/the-ultimate-guide-to-bip39-seed-phrase-mnemonics-generator