[rules-users] Compound rules?

Hi All, Newbie terminology question: what do you call it when you want to assert the state of several objects in working memory? Example: your working memory is full of marble objects. I know how to test each marble for color, but if there is a red marble, a blue marble and a yellow marble then I have enough marbles for a set. How can test the state of the working memory? Is this possible with Drools? Thanks, Jayne2520