I took the index with the words, converted the variety to binary, extra three zeros, calculated the sha256 digest, took the main part of the hexadecimal to transform it to binary, extra a few zeros towards the 8 digits in the binary and got 00000010011 which translates to 19 in https://top10bookmark.com/story18898911/the-ultimate-guide-to-bip39-seed-phrase-mnemonics-generator