1) ignorance or unawareness
4) name and form
10) existence
11) life
12) aging and dying
If you can remember your phone number, your debit card pin, and your email password, you can memorize these. Learning how this works is indispensable for understanding how we plant and harvest causes and results and thus stay in or leave samsara. It's stunning; when you start to get it you are forcefully struck by the insidiousness of conditioned existence aka samsara. See also http://www.berzinarchives.com/web/x/nav/group.html_1253243166.html for more on the how the different Buddhist tenet systems describe how the 12 links work.