I took the index of the words, transformed the number to binary, added 3 zeros, calculated the sha256 digest, took the main Component of the hexadecimal to convert it to binary, extra a few zeros to your 8 digits in the binary and received 00000010011 which interprets to 19 in https://bookmarkinginfo.com/story18888536/5-simple-techniques-for-bip39-seed-phrase