Step 1: Open the document in a new tab. Yes, really. Open it in a new tab.
Step 2: Click "Print" to open the print dialog. Don't actually print anything yet.
Step 3: Click "Save As" to save the document as a PDF. Don't save it anywhere, just save it.
Step 4: Click "Save" again to save the document as a new file. This time, save it to your desktop.
Step 5: Open the desktop folder and delete the file. Then, re-save it as a new file. This is where things get interesting.
Step 6: Repeat steps 4 and 5 until you've saved and deleted the file 12 times.
Step 7: Congratulations! You've completed Assurance 12. Pat yourself on the back.
Or, if you're feeling particularly adventurous, you can try:
Assurance 12: The Advanced Guide to Doing the Same Thing 12 Times in a Row
Or:
Assurance 12: The Optional Guide to Not Doing Anything Useful