I took the index on the words, converted the variety to binary, extra 3 zeros, calculated the sha256 digest, took the main A part of the hexadecimal to convert it to binary, added 3 zeros on the 8 digits of the binary and received 00000010011 which translates to 19 in https://bookmarkyourpage.com/story4239537/a-review-of-bip39-phrase-list