I took the index on the words, transformed the range to binary, added 3 zeros, calculated the sha256 digest, took the very first A part of the hexadecimal to convert it to binary, added three zeros into the eight digits from the binary and received 00000010011 which translates to 19 https://bookmarkrange.com/story20234485/the-ultimate-guide-to-bip39-seed-phrase-mnemonics-generator