I took the index on the words, transformed the amount to binary, included three zeros, calculated the sha256 digest, took the very first Section of the hexadecimal to transform it to binary, added a few zeros for the 8 digits from the binary and received 00000010011 which translates to 19 https://socialexpresions.com/story4300038/the-ultimate-guide-to-bip39-seed-phrase-mnemonics-generator