Can someone explain to me about PCC to UCLA articulation?

<p><a href="http://www.ugeducation.ucla.edu/counseling/articulations/ge2/pcc2.pdf%5B/url%5D"&gt;http://www.ugeducation.ucla.edu/counseling/articulations/ge2/pcc2.pdf&lt;/a&gt;&lt;/p>

<p>it says that "in each subgroup one of the two courses must be a five(5) units and carry either lab, demonstration, or writing II credit. each of the other two courses may be four(4) units." however, i've looked at how many units some of them are like sociology 2 is only 3 units? so i dont understand what is meant by the five unit course means. i'm a high school junior looking into going to community college. any help will be appreciated, thanks :D</p>