I took the index of the words, transformed the variety to binary, extra 3 zeros, calculated the sha256 digest, took the primary Portion of the hexadecimal to convert it to binary, added 3 zeros for the 8 digits in the binary and obtained 00000010011 which translates to 19 in decimal. https://scrapbookmarket.com/story19147873/a-review-of-bip39-phrase-list