Constituency shows subordination by way of projections. One of the two words projects its category status up to the root node of the entire structure and is therefore the head of the structure. Dependency also shows subordination, but it does so with fewer nodes in the tree. The head directly dominates its dependent. These trees illustrating subordination can be compared with trees illustrating coordination. There are various proposals concerning the tree representations of coordinate structures. The following trees are just suggestive in this regard. The constituency relation is again shown in the a-trees on the left, and the dependency relation in the b-trees on the right: