I took the index of the words, converted the variety to binary, included 3 zeros, calculated the sha256 digest, took the first A part of the hexadecimal to convert it to binary, extra a few zeros to your eight digits in the binary and received 00000010011 which translates to 19 https://thebookmarkid.com/story18906105/an-unbiased-view-of-bip39-seed-phrase-github