These 12 colors are the most popular in China and Japan. They use a 12 color selection to describe most colors instead of 7.
Which is your favorite color? In order: Red, Orange, Yellow, Olive, Green, Jade, Teal, Periwinkle, Blue, Purple, Hot Pink, or Pink? My favorite color is seafoam green; which is between Jade and Teal.
Who else has trouble seeing between Olive and Green? For me it helps to immagine Olive as a banana and Green as a lime; or Olive as rough and Green as shimmering.
These colors are all 30 degrees apart on Photoshop's color wheel. The perfect uncolor-blind person views these colors as the 12 most different of hues. I'm moderately green color blind and color is one of my most favorite things.
[b]EDIT
/b] On my Sharp Aquos Quattron I can see the difference in Olive pretty clearly.