I took the index from the words, transformed the selection to binary, added a few zeros, calculated the sha256 digest, took the primary Portion of the hexadecimal to convert it to binary, added three zeros for the 8 digits with the binary and got 00000010011 which translates to 19 in https://bookmarkshome.com/story4474015/5-simple-techniques-for-bip39-seed-phrase