I took the index on the words, transformed the variety to binary, extra 3 zeros, calculated the sha256 digest, took the primary Element of the hexadecimal to transform it to binary, included a few zeros to the 8 digits of your binary and got 00000010011 which interprets to 19 in https://bookmarkize.com/story18829564/5-simple-techniques-for-bip39-seed-phrase