From the moment they place two words together (and possibly even before) children seem to realize that language is not just a random conglomeration of words. They express each relationship consistently, so that, for example, in the actor–action relationship, the actor comes first, the action second as in MAMA COME, KITTY PLAY, KATHY GO. Exceptions occur when a wrong rule has been deduced, or when a child is groping towards a rule. And even at the two-word stage, children are creative in their speech. They use combinations of words they have not heard before.